Bump v13.2.1

Revert "Bump v13.3.0"
This reverts commit c2de2eaaa0.
2026-02-19 03:14:51 -05:00 · 2021-08-17 15:00:33 -07:00 · 2021-08-17 14:58:38 -07:00 · 2021-08-17 14:23:19 -07:00 · 2021-08-17 14:08:25 -07:00 · 2021-08-17 01:25:11 -07:00
945 changed files with 21744 additions and 11824 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -57,6 +57,16 @@ parameters:
    type: boolean
    default: false

+# Executors
+executors:
+  linux-arm:
+    resource_class: electronjs/linux-arm
+    machine: true
+
+  linux-arm64:
+    resource_class: electronjs/linux-arm64
+    machine: true
+
 # The config expects the following environment variables to be set:
 #  - "SLACK_WEBHOOK" Slack hook URL to send notifications.
 #
@@ -69,7 +79,7 @@ parameters:
 # Build machines configs.
 docker-image: &docker-image
  docker:
-    - image: electron.azurecr.io/build:4cec2c5ab66765caa724e37bae2bffb9b29722a5
+    - image: electron.azurecr.io/build:6555a80939fb4c3ddf9343b3f140e573f40de225

 machine-linux-medium: &machine-linux-medium
  <<: *docker-image
@@ -85,17 +95,21 @@ machine-linux-2xlarge: &machine-linux-2xlarge

 machine-mac: &machine-mac
  macos:
-    xcode: "12.2.0"
+    xcode: "12.4.0"

 machine-mac-large: &machine-mac-large
  resource_class: large
  macos:
-    xcode: "12.2.0"
+    xcode: "12.4.0"

 machine-mac-large-arm: &machine-mac-large-arm
  resource_class: large
  macos:
-    xcode: "12.2.0"
+    xcode: "12.4.0"
+
+machine-mac-arm64: &machine-mac-arm64
+  resource_class: electronjs/macos-arm64
+  machine: true

 # Build configurations options.
 env-testing-build: &env-testing-build
@@ -141,6 +155,7 @@ env-apple-silicon: &env-apple-silicon
  GN_EXTRA_ARGS: 'target_cpu = "arm64" use_prebuilt_v8_context_snapshot = true'
  TARGET_ARCH: arm64
  USE_PREBUILT_V8_CONTEXT_SNAPSHOT: 1
+  npm_config_arch: arm64

 env-arm64: &env-arm64
  GN_EXTRA_ARGS: 'target_cpu = "arm64" fatal_linker_warnings = false enable_linux_installer = false'
@@ -225,6 +240,25 @@ step-maybe-notify-slack-success: &step-maybe-notify-slack-success
      fi
    when: on_success

+step-maybe-cleanup-arm64-mac: &step-maybe-cleanup-arm64-mac
+  run:
+    name: Cleanup after testing
+    command: |
+      if  [ "$TARGET_ARCH" == "arm64" ] &&[ "`uname`" == "Darwin" ]; then
+        killall Electron || echo "No Electron processes left running"
+        killall Safari || echo "No Safari processes left running"
+        rm -rf ~/Library/Application\ Support/Electron*
+        rm -rf ~/Library/Application\ Support/electron*
+      elif [ "$TARGET_ARCH" == "arm" ] || [ "$TARGET_ARCH" == "arm64" ]; then
+        XVFB=/usr/bin/Xvfb
+        /sbin/start-stop-daemon --stop --exec $XVFB || echo "Xvfb not running"
+        pkill electron || echo "electron not running"
+        rm -rf ~/.config/Electron*
+        rm -rf ~/.config/electron*
+      fi
+
+    when: always
+
 step-checkout-electron: &step-checkout-electron
  checkout:
    path: src/electron
@@ -261,7 +295,7 @@ step-gclient-sync: &step-gclient-sync
          if ! git diff-index --quiet HEAD --; then
            # There are changes to the patches. Make a git commit with the updated patches
            git add patches
-            GIT_COMMITTER_NAME="Electron Bot" GIT_COMMITTER_EMAIL="electron@github.com" git commit -m "update patches" --author="Electron Bot <electron@github.com>"
+            GIT_COMMITTER_NAME="PatchUp" GIT_COMMITTER_EMAIL="73610968+patchup[bot]@users.noreply.github.com" git commit -m "chore: update patches" --author="PatchUp <73610968+patchup[bot]@users.noreply.github.com>"
            # Export it
            mkdir -p ../../patches
            git format-patch -1 --stdout --keep-subject --no-stat --full-index > ../../patches/update-patches.patch
@@ -295,10 +329,10 @@ step-setup-goma-for-build: &step-setup-goma-for-build
  run:
    name: Setup Goma
    command: |
-      if [ "`uname`" == "Linux" ]; then
-        echo 'export NUMBER_OF_NINJA_PROCESSES=300' >> $BASH_ENV
-      else
-        echo 'export NUMBER_OF_NINJA_PROCESSES=25' >> $BASH_ENV
+      echo 'export NUMBER_OF_NINJA_PROCESSES=300' >> $BASH_ENV
+      if [ "`uname`" == "Darwin" ]; then
+        echo 'ulimit -n 10000' >> $BASH_ENV
+        echo 'sudo launchctl limit maxfiles 65536 200000' >> $BASH_ENV
      fi
      if [ ! -z "$RAW_GOMA_AUTH" ]; then
        echo $RAW_GOMA_AUTH > ~/.goma_oauth2_config
@@ -307,24 +341,28 @@ step-setup-goma-for-build: &step-setup-goma-for-build
      cd build-tools
      npm install
      mkdir third_party
-      node -e "require('./src/utils/goma.js').downloadAndPrepare()"
-      node -e "require('./src/utils/goma.js').ensure()"
+      node -e "require('./src/utils/goma.js').downloadAndPrepare({ gomaOneForAll: true })"
+      export GOMA_FALLBACK_ON_AUTH_FAILURE=true
+      third_party/goma/goma_ctl.py ensure_start
      echo 'export GN_GOMA_FILE='`node -e "console.log(require('./src/utils/goma.js').gnFilePath)"` >> $BASH_ENV
      echo 'export LOCAL_GOMA_DIR='`node -e "console.log(require('./src/utils/goma.js').dir)"` >> $BASH_ENV
+      echo 'export GOMA_FALLBACK_ON_AUTH_FAILURE=true' >> $BASH_ENV
      cd ..

 step-restore-brew-cache: &step-restore-brew-cache
  restore_cache:
    paths:
-      - /usr/local/Homebrew
+      - /usr/local/Cellar/gnu-tar
+      - /usr/local/bin/gtar
    keys:
-      - v2-brew-cache-{{ arch }}
+      - v4-brew-cache-{{ arch }}

 step-save-brew-cache: &step-save-brew-cache
  save_cache:
    paths:
-      - /usr/local/Homebrew
-    key: v2-brew-cache-{{ arch }}
+      - /usr/local/Cellar/gnu-tar
+      - /usr/local/bin/gtar
+    key: v4-brew-cache-{{ arch }}
    name: Persisting brew cache

 step-get-more-space-on-mac: &step-get-more-space-on-mac
@@ -445,16 +483,13 @@ step-fix-sync-on-mac: &step-fix-sync-on-mac
        # Fix Clang Install (wrong binary)
        rm -rf src/third_party/llvm-build
        python src/tools/clang/scripts/update.py
-        # Fix Framework Header Installs (symlinks not retained)
-        rm -rf src/electron/external_binaries
-        python src/electron/script/update-external-binaries.py
      fi

 step-install-signing-cert-on-mac: &step-install-signing-cert-on-mac
  run:
    name: Import and trust self-signed codesigning cert on MacOS
    command: |
-      if [ "`uname`" == "Darwin" ]; then
+      if  [ "$TARGET_ARCH" != "arm64" ] && [ "`uname`" == "Darwin" ]; then
        cd src/electron
        ./script/codesign/generate-identity.sh
      fi
@@ -464,8 +499,10 @@ step-install-gnutar-on-mac: &step-install-gnutar-on-mac
    name: Install gnu-tar on macos
    command: |
      if [ "`uname`" == "Darwin" ]; then
-        brew update
-        brew install gnu-tar
+        if [ ! -d /usr/local/Cellar/gnu-tar/ ]; then
+          brew update
+          brew install gnu-tar
+        fi
        ln -fs /usr/local/bin/gtar /usr/local/bin/tar
      fi

@@ -483,10 +520,10 @@ step-gn-check: &step-gn-check
      cd src
      gn check out/Default //electron:electron_lib
      gn check out/Default //electron:electron_app
-      gn check out/Default //electron:manifests
      gn check out/Default //electron/shell/common/api:mojo
      # Check the hunspell filenames
      node electron/script/gen-hunspell-filenames.js --check
+      node electron/script/gen-libc++-filenames.js --check

 step-electron-build: &step-electron-build
  run:
@@ -512,7 +549,10 @@ step-electron-build: &step-electron-build
        ninja -C out/Default electron:electron_mksnapshot_zip -j $NUMBER_OF_NINJA_PROCESSES
        ninja -C out/Default tools/v8_context_snapshot -j $NUMBER_OF_NINJA_PROCESSES
        gn desc out/Default v8:run_mksnapshot_default args > out/Default/mksnapshot_args
+        (cd out/Default; zip mksnapshot.zip mksnapshot_args clang_x64_v8_arm64/gen/v8/embedded.S)
+        rm -rf out/Default/clang_x64_v8_arm64/gen
        rm -rf out/Default/clang_x64_v8_arm64/obj
+        rm -rf out/Default/clang_x64/obj

        # Regenerate because we just deleted some ninja files 
        gn gen out/Default --args="import(\"$GN_CONFIG\") import(\"$GN_GOMA_FILE\") $GN_EXTRA_ARGS $GN_BUILDFLAG_ARGS"
@@ -666,6 +706,12 @@ step-persist-data-for-tests: &step-persist-data-for-tests
      - src/electron
      - src/third_party/electron_node
      - src/third_party/nan
+      - src/cross-arch-snapshots
+      - src/third_party/llvm-build
+      - src/build/linux
+      - src/buildtools/third_party/libc++
+      - src/buildtools/third_party/libc++abi
+      - src/out/Default/obj/buildtools/third_party

 step-electron-dist-unzip: &step-electron-dist-unzip
  run:
@@ -674,28 +720,34 @@ step-electron-dist-unzip: &step-electron-dist-unzip
      cd src/out/Default
      # -o  overwrite files WITHOUT prompting
      # TODO(alexeykuzmin): Remove '-o' when it's no longer needed.
-      unzip -o dist.zip
+      # -: allows to extract archive members into  locations  outside
+      #    of the current ``extraction root folder''.
+      #    ASan builds have the llvm-symbolizer binaries listed as
+      #    runtime_deps, with their paths as `../../third_party/...`
+      #    unzip exits with non-zero code on such zip files unless -: is
+      #    passed.
+      unzip -:o dist.zip

 step-ffmpeg-unzip: &step-ffmpeg-unzip
  run:
    name: Unzip ffmpeg.zip
    command: |
      cd src/out/ffmpeg
-      unzip -o ffmpeg.zip
+      unzip -:o ffmpeg.zip

 step-mksnapshot-unzip: &step-mksnapshot-unzip
  run:
    name: Unzip mksnapshot.zip
    command: |
      cd src/out/Default
-      unzip -o mksnapshot.zip
+      unzip -:o mksnapshot.zip

 step-chromedriver-unzip: &step-chromedriver-unzip
  run:
    name: Unzip chromedriver.zip
    command: |
      cd src/out/Default
-      unzip -o chromedriver.zip
+      unzip -:o chromedriver.zip

 step-ffmpeg-gn-gen: &step-ffmpeg-gn-gen
  run:
@@ -727,15 +779,23 @@ step-verify-mksnapshot: &step-verify-mksnapshot
  run:
    name: Verify mksnapshot
    command: |
-      cd src
-      python electron/script/verify-mksnapshot.py --source-root "$PWD" --build-dir out/Default
+      if [ "$IS_ASAN" != "1" ]; then
+        cd src
+        if [ "$TARGET_ARCH" == "arm" ] || [ "$TARGET_ARCH" == "arm64" ]; then
+          python electron/script/verify-mksnapshot.py --source-root "$PWD" --build-dir out/Default --snapshot-files-dir $PWD/cross-arch-snapshots
+        else
+          python electron/script/verify-mksnapshot.py --source-root "$PWD" --build-dir out/Default
+        fi
+      fi

 step-verify-chromedriver: &step-verify-chromedriver
  run:
    name: Verify ChromeDriver
    command: |
-      cd src
-      python electron/script/verify-chromedriver.py --source-root "$PWD" --build-dir out/Default
+      if [ "$IS_ASAN" != "1" ]; then
+        cd src
+        python electron/script/verify-chromedriver.py --source-root "$PWD" --build-dir out/Default
+      fi

 step-setup-linux-for-headless-testing: &step-setup-linux-for-headless-testing
  run:
@@ -802,6 +862,17 @@ step-hunspell-store: &step-hunspell-store
    path: src/out/Default/hunspell_dictionaries.zip
    destination: hunspell_dictionaries.zip

+step-maybe-generate-libcxx: &step-maybe-generate-libcxx
+  run:
+    name: maybe generate libcxx
+    command: |
+      cd src
+      if [ "`uname`" == "Linux" ]; then
+        ninja -C out/Default electron:libcxx_headers_zip -j $NUMBER_OF_NINJA_PROCESSES
+        ninja -C out/Default electron:libcxxabi_headers_zip -j $NUMBER_OF_NINJA_PROCESSES
+        ninja -C out/Default electron:libcxx_objects_zip -j $NUMBER_OF_NINJA_PROCESSES
+      fi
+
 step-maybe-generate-breakpad-symbols: &step-maybe-generate-breakpad-symbols
  run:
    name: Generate breakpad symbols
@@ -820,7 +891,7 @@ step-maybe-zip-symbols: &step-maybe-zip-symbols
      export BUILD_PATH="$PWD/out/Default"
      ninja -C out/Default electron:licenses
      ninja -C out/Default electron:electron_version
-      electron/script/zip-symbols.py -b $BUILD_PATH
+      DELETE_DSYMS_AFTER_ZIP=1 electron/script/zip-symbols.py -b $BUILD_PATH

 step-symbols-store: &step-symbols-store
  store_artifacts:
@@ -831,7 +902,7 @@ step-maybe-cross-arch-snapshot: &step-maybe-cross-arch-snapshot
  run:
    name: Generate cross arch snapshot (arm/arm64)
    command: |
-      if [ "$TRIGGER_ARM_TEST" == "true" ] && [ -z "$CIRCLE_PR_NUMBER" ]; then
+      if [ "$GENERATE_CROSS_ARCH_SNAPSHOT" == "true" ] && [ -z "$CIRCLE_PR_NUMBER" ]; then
        cd src
        if [ "$TARGET_ARCH" == "arm" ]; then
          export MKSNAPSHOT_PATH="clang_x86_v8_arm"
@@ -855,23 +926,6 @@ step-maybe-cross-arch-snapshot-store: &step-maybe-cross-arch-snapshot-store
    path: src/cross-arch-snapshots
    destination: cross-arch-snapshots

-step-maybe-trigger-arm-test: &step-maybe-trigger-arm-test
-  run:
-    name: Trigger an arm test on VSTS if applicable
-    command: |
-      cd src
-      # Only run for non-fork prs
-      if [ "$TRIGGER_ARM_TEST" == "true" ] && [ -z "$CIRCLE_PR_NUMBER" ]; then
-        #Trigger VSTS job, passing along CircleCI job number and branch to build
-        if [ "`uname`" == "Darwin" ]; then
-          echo "Triggering electron-arm2-testing build on Azure DevOps"  
-          node electron/script/release/ci-release-build.js --job=electron-arm2-testing --ci=DevOps --armTest --circleBuildNum=$CIRCLE_BUILD_NUM $CIRCLE_BRANCH
-        else
-          echo "Triggering electron-$TARGET_ARCH-testing build on VSTS"  
-          node electron/script/release/ci-release-build.js --job=electron-$TARGET_ARCH-testing --ci=VSTS --armTest --circleBuildNum=$CIRCLE_BUILD_NUM $CIRCLE_BRANCH
-        fi
-      fi
-
 step-maybe-generate-typescript-defs: &step-maybe-generate-typescript-defs
  run:
    name: Generate type declarations
@@ -893,6 +947,8 @@ step-ninja-summary: &step-ninja-summary
  run:
    name: Print ninja summary
    command: |
+      set +e
+      set +o pipefail
      python depot_tools/post_build_ninja_summary.py -C src/out/Default

 step-ninja-report: &step-ninja-report
@@ -991,7 +1047,7 @@ step-minimize-workspace-size-from-checkout: &step-minimize-workspace-size-from-c
    name: Remove some unused data to avoid storing it in the workspace/cache
    command: |
      rm -rf src/android_webview
-      rm -rf src/ios
+      rm -rf src/ios/chrome
      rm -rf src/third_party/blink/web_tests
      rm -rf src/third_party/blink/perf_tests
      rm -rf src/third_party/WebKit/LayoutTests
@@ -1196,7 +1252,6 @@ steps-electron-ts-compile-for-doc-change: &steps-electron-ts-compile-for-doc-cha
    - *step-depot-tools-add-to-path
    - *step-setup-env-for-build
    - *step-setup-goma-for-build
-    - *step-restore-brew-cache
    - *step-get-more-space-on-mac
    - *step-install-npm-deps-on-mac
    - *step-fix-sync-on-mac
@@ -1250,18 +1305,6 @@ steps-verify-ffmpeg: &steps-verify-ffmpeg
    - *step-verify-ffmpeg
    - *step-maybe-notify-slack-failure

-steps-verify-chromedriver: &steps-verify-chromedriver
-  steps:
-    - attach_workspace:
-        at: .
-    - *step-depot-tools-add-to-path
-    - *step-electron-dist-unzip
-    - *step-chromedriver-unzip
-    - *step-setup-linux-for-headless-testing
-
-    - *step-verify-chromedriver
-    - *step-maybe-notify-slack-failure
-
 steps-tests: &steps-tests
  steps:
    - attach_workspace:
@@ -1285,8 +1328,27 @@ steps-tests: &steps-tests
          ELECTRON_DISABLE_SECURITY_WARNINGS: 1
        command: |
          cd src
-          (cd electron && node script/yarn test --runners=main --trace-uncaught --enable-logging --files $(circleci tests glob spec-main/*-spec.ts | circleci tests split))
-          (cd electron && node script/yarn test --runners=remote --trace-uncaught --enable-logging --files $(circleci tests glob spec/*-spec.js | circleci tests split))
+          if [ "$IS_ASAN" == "1" ]; then
+            ASAN_SYMBOLIZE="$PWD/tools/valgrind/asan/asan_symbolize.py --executable-path=$PWD/out/Default/electron"
+            export ASAN_OPTIONS="symbolize=0 handle_abort=1"
+            export G_SLICE=always-malloc
+            export NSS_DISABLE_ARENA_FREE_LIST=1
+            export NSS_DISABLE_UNLOAD=1
+            export LLVM_SYMBOLIZER_PATH=$PWD/third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer
+            export MOCHA_TIMEOUT=180000
+            echo "Piping output to ASAN_SYMBOLIZE ($ASAN_SYMBOLIZE)"
+            (cd electron && node script/yarn test --runners=main --trace-uncaught --enable-logging --files $(circleci tests glob spec-main/*-spec.ts | circleci tests split)) 2>&1 | $ASAN_SYMBOLIZE
+            (cd electron && node script/yarn test --runners=remote --trace-uncaught --enable-logging --files $(circleci tests glob spec/*-spec.js | circleci tests split)) 2>&1 | $ASAN_SYMBOLIZE
+          else
+            if [ "$TARGET_ARCH" == "arm" ] || [ "$TARGET_ARCH" == "arm64" ]; then
+              export ELECTRON_SKIP_NATIVE_MODULE_TESTS=true
+              (cd electron && node script/yarn test --runners=main --trace-uncaught --enable-logging)
+              (cd electron && node script/yarn test --runners=remote --trace-uncaught --enable-logging)
+            else
+              (cd electron && node script/yarn test --runners=main --trace-uncaught --enable-logging --files $(circleci tests glob spec-main/*-spec.ts | circleci tests split))
+              (cd electron && node script/yarn test --runners=remote --trace-uncaught --enable-logging --files $(circleci tests glob spec/*-spec.js | circleci tests split))
+            fi
+          fi
    - run:
        name: Check test results existence
        command: |
@@ -1307,6 +1369,8 @@ steps-tests: &steps-tests

    - *step-maybe-notify-slack-failure

+    - *step-maybe-cleanup-arm64-mac
+
 steps-test-nan: &steps-test-nan
  steps:
    - attach_workspace:
@@ -1421,9 +1485,9 @@ commands:
      restore-src-cache:
        type: boolean
        default: true
-      preserve-vendor-dirs:
+      build-nonproprietary-ffmpeg:
        type: boolean
-        default: false
+        default: true
    steps:
      - when:
          condition: << parameters.attach >>
@@ -1461,26 +1525,11 @@ commands:
            - store_artifacts:
                path: patches
            # These next few steps reset Electron to the correct commit regardless of which cache was restored
-            - when:
-                condition: << parameters.preserve-vendor-dirs >>
-                steps:
-                  - run:
-                      name: Preserve vendor dirs for release
-                      command: |
-                        mv src/electron/vendor/requests .
            - run:
                name: Wipe Electron
                command: rm -rf src/electron
            - *step-checkout-electron
            - *step-run-electron-only-hooks
-            - when:
-                condition: << parameters.preserve-vendor-dirs >>
-                steps:
-                  - run:
-                      name: Preserve vendor dirs for release
-                      command: |
-                        rm -rf src/electron/vendor/requests
-                        mv requests src/electron/vendor/requests
            - *step-generate-deps-hash-cleanly
            - *step-mark-sync-done
            - *step-minimize-workspace-size-from-checkout
@@ -1537,10 +1586,13 @@ commands:
            - *step-electron-chromedriver-build
            - *step-electron-chromedriver-store

-            # ffmpeg
-            - *step-ffmpeg-gn-gen
-            - *step-ffmpeg-build
-            - *step-ffmpeg-store
+            - when:
+                condition: << parameters.build-nonproprietary-ffmpeg >>
+                steps:
+                  # ffmpeg
+                  - *step-ffmpeg-gn-gen
+                  - *step-ffmpeg-build
+                  - *step-ffmpeg-store

            # hunspell
            - *step-hunspell-build
@@ -1579,9 +1631,6 @@ commands:
                steps:
                  - *step-save-out-cache

-            # Trigger tests on arm hardware if needed
-            - *step-maybe-trigger-arm-test
-
            - *step-maybe-notify-slack-failure

  electron-publish:
@@ -1649,6 +1698,9 @@ commands:
      - *step-hunspell-build
      - *step-hunspell-store

+      # libcxx
+      - *step-maybe-generate-libcxx
+
      # typescript defs
      - *step-maybe-generate-typescript-defs

@@ -1676,7 +1728,7 @@ jobs:
    <<: *machine-linux-2xlarge
    environment:
      <<: *env-linux-2xlarge
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm=True --custom-var=checkout_arm64=True --custom-var=checkout_requests=True'
+      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm=True --custom-var=checkout_arm64=True'
    steps:
      - electron-build:
          persist: false
@@ -1684,7 +1736,6 @@ jobs:
          checkout: true
          persist-checkout: true
          restore-src-cache: false
-          preserve-vendor-dirs: true

  linux-checkout-fast:
    <<: *machine-linux-2xlarge
@@ -1735,7 +1786,7 @@ jobs:
      <<: *env-linux-2xlarge
      <<: *env-testing-build
      <<: *env-macos-build
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_mac=True --custom-var=host_os=mac --custom-var=checkout_requests=True'
+      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_mac=True --custom-var=host_os=mac'
    steps:
      - electron-build:
          persist: false
@@ -1743,7 +1794,6 @@ jobs:
          checkout: true
          persist-checkout: true
          restore-src-cache: false
-          preserve-vendor-dirs: true

  mac-checkout-fast:
    <<: *machine-linux-2xlarge
@@ -1782,6 +1832,22 @@ jobs:
          checkout: true
          use-out-cache: false

+  linux-x64-testing-asan:
+    <<: *machine-linux-2xlarge
+    environment:
+      <<: *env-global
+      <<: *env-testing-build
+      <<: *env-ninja-status
+      CHECK_DIST_MANIFEST: '0'
+      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm=True --custom-var=checkout_arm64=True'
+      GN_EXTRA_ARGS: 'is_asan = true'
+    steps:
+      - electron-build:
+          persist: true
+          checkout: true
+          use-out-cache: false
+          build-nonproprietary-ffmpeg: false
+
  linux-x64-testing-no-run-as-node:
    <<: *machine-linux-2xlarge
    environment:
@@ -1820,7 +1886,6 @@ jobs:
    <<: *machine-linux-2xlarge
    environment:
      <<: *env-linux-2xlarge-release
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_requests=True'
      <<: *env-release-build
      UPLOAD_TO_S3: << pipeline.parameters.upload-to-s3 >>
      <<: *env-ninja-status
@@ -1873,7 +1938,6 @@ jobs:
    <<: *machine-linux-2xlarge
    environment:
      <<: *env-linux-2xlarge-release
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_requests=True'
      <<: *env-ia32
      <<: *env-release-build
      <<: *env-32bit-release
@@ -1906,10 +1970,11 @@ jobs:
      <<: *env-testing-build
      <<: *env-ninja-status
      TRIGGER_ARM_TEST: true
+      GENERATE_CROSS_ARCH_SNAPSHOT: true
      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm=True --custom-var=checkout_arm64=True'
    steps:
      - electron-build:
-          persist: false
+          persist: true
          checkout: true
          use-out-cache: false

@@ -1934,7 +1999,7 @@ jobs:
      <<: *env-arm
      <<: *env-release-build
      <<: *env-32bit-release
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm=True --custom-var=checkout_requests=True'
+      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm=True'
      UPLOAD_TO_S3: << pipeline.parameters.upload-to-s3 >>
      <<: *env-ninja-status
    steps:
@@ -1964,10 +2029,11 @@ jobs:
      <<: *env-testing-build
      <<: *env-ninja-status
      TRIGGER_ARM_TEST: true
+      GENERATE_CROSS_ARCH_SNAPSHOT: true
      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm=True --custom-var=checkout_arm64=True'
    steps:
      - electron-build:
-          persist: false
+          persist: true
          checkout: true
          use-out-cache: false

@@ -1999,7 +2065,7 @@ jobs:
      <<: *env-linux-2xlarge-release
      <<: *env-arm64
      <<: *env-release-build
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm64=True --custom-var=checkout_requests=True'
+      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_arm64=True'
      UPLOAD_TO_S3: << pipeline.parameters.upload-to-s3 >>
      <<: *env-ninja-status
    steps:
@@ -2061,7 +2127,6 @@ jobs:
    environment:
      <<: *env-mac-large-release
      <<: *env-release-build
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_requests=True'
      UPLOAD_TO_S3: << pipeline.parameters.upload-to-s3 >>
      <<: *env-ninja-status
    steps:
@@ -2075,7 +2140,6 @@ jobs:
      <<: *env-mac-large-release
      <<: *env-release-build
      <<: *env-apple-silicon
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_requests=True'
      UPLOAD_TO_S3: << pipeline.parameters.upload-to-s3 >>
      <<: *env-ninja-status
    steps:
@@ -2117,6 +2181,7 @@ jobs:
      <<: *env-macos-build
      <<: *env-apple-silicon
      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_mac=True --custom-var=host_os=mac'
+      GENERATE_CROSS_ARCH_SNAPSHOT: true
    steps:
      - electron-build:
          persist: true
@@ -2169,7 +2234,6 @@ jobs:
      <<: *env-mac-large-release
      <<: *env-mas
      <<: *env-release-build
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_requests=True'
      UPLOAD_TO_S3: << pipeline.parameters.upload-to-s3 >>
      <<: *env-ninja-status
    steps:
@@ -2183,7 +2247,6 @@ jobs:
      <<: *env-mac-large-release
      <<: *env-mas-apple-silicon
      <<: *env-release-build
-      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_requests=True'
      UPLOAD_TO_S3: << pipeline.parameters.upload-to-s3 >>
      <<: *env-ninja-status
    steps:
@@ -2225,6 +2288,7 @@ jobs:
      <<: *env-macos-build
      <<: *env-mas-apple-silicon
      GCLIENT_EXTRA_ARGS: '--custom-var=checkout_mac=True --custom-var=host_os=mac'
+      GENERATE_CROSS_ARCH_SNAPSHOT: true
    steps:
      - electron-build:
          persist: true
@@ -2277,6 +2341,17 @@ jobs:
    parallelism: 3
    <<: *steps-tests

+  linux-x64-testing-asan-tests:
+    <<: *machine-linux-xlarge
+    environment:
+      <<: *env-linux-medium
+      <<: *env-headless-testing
+      <<: *env-stack-dumping
+      IS_ASAN: '1'
+      DISABLE_CRASH_REPORTER_TESTS: '1'
+    parallelism: 3
+    <<: *steps-tests
+
  linux-x64-testing-nan:
    <<: *machine-linux-medium
    environment:
@@ -2355,6 +2430,24 @@ jobs:
      <<: *env-send-slack-notifications
    <<: *steps-verify-ffmpeg

+  linux-arm-testing-tests:
+    executor: linux-arm
+    environment:
+      <<: *env-arm
+      <<: *env-global
+      <<: *env-headless-testing
+      <<: *env-stack-dumping
+    <<: *steps-tests
+
+  linux-arm64-testing-tests:
+    executor: linux-arm64
+    environment:
+      <<: *env-arm64
+      <<: *env-global
+      <<: *env-headless-testing
+      <<: *env-stack-dumping
+    <<: *steps-tests
+
  osx-testing-x64-tests:
    <<: *machine-mac-large
    environment:
@@ -2378,6 +2471,14 @@ jobs:
      <<: *env-send-slack-notifications
    <<: *steps-verify-ffmpeg

+  osx-testing-arm64-tests:  
+    <<: *machine-mac-arm64
+    environment:
+      <<: *env-mac-large
+      <<: *env-stack-dumping
+      <<: *env-apple-silicon
+    <<: *steps-tests
+
  mas-testing-x64-tests:
    <<: *machine-mac-large
    environment:
@@ -2401,6 +2502,14 @@ jobs:
      <<: *env-send-slack-notifications
    <<: *steps-verify-ffmpeg

+  mas-testing-arm64-tests:
+    <<: *machine-mac-arm64
+    environment:
+      <<: *env-mac-large
+      <<: *env-stack-dumping
+      <<: *env-apple-silicon
+    <<: *steps-tests
+
  # Layer 4: Summary.
  linux-x64-release-summary:
    <<: *machine-linux-medium
@@ -2535,15 +2644,19 @@ workflows:
    - osx-publish-x64-skip-checkout:
        requires:
          - mac-checkout
+        context: release-env
    - mas-publish-x64-skip-checkout:
        requires:
          - mac-checkout
+        context: release-env
    - osx-publish-arm64-skip-checkout:
        requires:
          - mac-checkout
+        context: release-env
    - mas-publish-arm64-skip-checkout:
        requires:
          - mac-checkout
+        context: release-env

  lint:
    when: << pipeline.parameters.run-lint >>
@@ -2557,6 +2670,7 @@ workflows:
      - linux-checkout-and-save-cache

      - linux-x64-testing
+      - linux-x64-testing-asan
      - linux-x64-testing-no-run-as-node
      - linux-x64-testing-gn-check:
          requires:
@@ -2564,6 +2678,9 @@ workflows:
      - linux-x64-testing-tests:
          requires:
            - linux-x64-testing
+      - linux-x64-testing-asan-tests:
+          requires:
+            - linux-x64-testing-asan
      - linux-x64-testing-nan:
          requires:
            - linux-x64-testing
@@ -2583,8 +2700,23 @@ workflows:
            - linux-ia32-testing

      - linux-arm-testing
+      - linux-arm-testing-tests:
+          filters:
+            branches:
+              # Do not run this on forked pull requests
+              ignore: /pull\/[0-9]+/        
+          requires:
+            - linux-arm-testing      

      - linux-arm64-testing
+      - linux-arm64-testing-tests:
+          filters:
+            branches:
+              # Do not run this on forked pull requests
+              ignore: /pull\/[0-9]+/        
+          requires:
+            - linux-arm64-testing
+
      - linux-arm64-testing-gn-check:
          requires:
            - linux-checkout-fast
@@ -2612,6 +2744,14 @@ workflows:
          requires:
            - mac-checkout-and-save-cache

+      - osx-testing-arm64-tests:
+          filters:
+            branches:
+              # Do not run this on forked pull requests
+              ignore: /pull\/[0-9]+/
+          requires:
+            - osx-testing-arm64
+
      - mas-testing-x64:
          requires:
            - mac-checkout-and-save-cache
@@ -2628,6 +2768,14 @@ workflows:
          requires:
            - mac-checkout-and-save-cache

+      - mas-testing-arm64-tests:
+          filters:
+            branches:
+              # Do not run this on forked pull requests
+              ignore: /pull\/[0-9]+/
+          requires:
+            - mas-testing-arm64
+
  nightly-linux-release-test:
    triggers:
      - schedule:
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,3 +1,2 @@
 *
 !tools/xvfb-init.sh
-!build/install-build-deps.sh
--- a/.env.example
+++ b/.env.example
@@ -4,4 +4,3 @@
 APPVEYOR_CLOUD_TOKEN=
 CIRCLE_TOKEN=
 ELECTRON_GITHUB_TOKEN=
-VSTS_TOKEN=
--- a/.github/ISSUE_TEMPLATE/Feature_request.md
+++ b/.github/ISSUE_TEMPLATE/Feature_request.md
@@ -1,27 +0,0 @@
---
-name: Feature request
-about: Suggest an idea for Electron
-
---
-
-<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
-->
-
-### Preflight Checklist
-<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->
-
-* [ ] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
-* [ ] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
-* [ ] I have searched the issue tracker for a feature request that matches the one I want to file, without success.
-
-### Problem Description
-<!-- Is your feature request related to a problem? Please add a clear and concise description of what the problem is. -->
-
-### Proposed Solution
-<!-- Describe the solution you'd like in a clear and concise manner -->
-
-### Alternatives Considered
-<!-- A clear and concise description of any alternative solutions or features you've considered. -->
-
-### Additional Information
-<!-- Add any other context about the problem here. -->
--- a/.github/ISSUE_TEMPLATE/feature_request.yml
+++ b/.github/ISSUE_TEMPLATE/feature_request.yml
@@ -0,0 +1,39 @@
+name: Feature Request
+about: Suggest an idea for Electron
+title: "[Feature Request]: "
+labels: "enhancement ✨"
+body:
+- type: textarea
+  attributes:
+    label: Preflight Checklist
+    description: Please ensure you've completed the following steps by replacing [ ] with [x]
+    value: |
+      * [ ] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
+      * [ ] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
+      * [ ] I have searched the issue tracker for a feature request that matches the one I want to file, without success.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Problem Description
+    description: Please add a clear and concise description of the problem you are seeking to solve with this feature request.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Proposed Solution
+    description: Describe the solution you'd like in a clear and concise manner.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Alternatives Considered
+    description: A clear and concise description of any alternative solutions or features you've considered. 
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Additional Information
+    description: Add any other context about the problem here.
+  validations:
+    required: true
--- a/.github/config.yml
+++ b/.github/config.yml
@@ -36,5 +36,6 @@ authorizedUsers:
  - loc
  - MarshallOfSound
  - miniak
+  - mlaurencin
  - nornagon
  - zcbenz
--- a/.github/semantic.yml
+++ b/.github/semantic.yml
@@ -0,0 +1,2 @@
+# Always validate the PR title, and ignore the commits
+titleOnly: true
--- a/.gitignore
+++ b/.gitignore
@@ -55,7 +55,7 @@ electron.d.ts
 spec/.hash

 # Eslint Cache
-.eslintcache
+.eslintcache*

 # Generated native addon files
 /spec-main/fixtures/native-addon/echo/build/
@@ -68,4 +68,6 @@ ts-gen
 .depshash-target

 # Used to accelerate builds after sync
-patches/mtime-cache.json
+patches/mtime-cache.json
+
+spec/fixtures/logo.png
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +0,0 @@
-[submodule "vendor/requests"]
-	path = vendor/requests
-	url = https://github.com/kennethreitz/requests
-[submodule "vendor/boto"]
-	path = vendor/boto
-	url = https://github.com/boto/boto.git
--- a/.markdownlint.autofix.json
+++ b/.markdownlint.autofix.json
@@ -0,0 +1,6 @@
+{
+  "default": false,
+  "no-trailing-spaces": {
+    "br_spaces": 0
+  }
+}
--- a/.markdownlint.json
+++ b/.markdownlint.json
@@ -0,0 +1,26 @@
+{
+  "commands-show-output": false,
+  "first-line-h1": false,
+  "header-increment": false,
+  "line-length": {
+    "code_blocks": false,
+    "tables": false,
+    "stern": true,
+    "line_length": -1
+  },
+  "no-bare-urls": false,
+  "no-blanks-blockquote": false,
+  "no-duplicate-header": {
+    "allow_different_nesting": true
+  },
+  "no-emphasis-as-header": false,
+  "no-hard-tabs": {
+    "code_blocks": false
+  },
+  "no-space-in-emphasis": false,
+  "no-trailing-punctuation": false,
+  "no-trailing-spaces": {
+    "br_spaces": 0
+  },
+  "single-h1": false
+}
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1,6 +1,7 @@
 import("//build/config/locales.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/manifest.gni")
+import("//components/os_crypt/features.gni")
 import("//components/spellcheck/spellcheck_build_features.gni")
 import("//content/public/app/mac_helpers.gni")
 import("//extensions/buildflags/buildflags.gni")
@@ -25,6 +26,8 @@ import("electron_paks.gni")
 import("filenames.auto.gni")
 import("filenames.gni")
 import("filenames.hunspell.gni")
+import("filenames.libcxx.gni")
+import("filenames.libcxxabi.gni")

 if (is_mac) {
  import("//build/config/mac/rules.gni")
@@ -265,21 +268,6 @@ if (is_linux) {
  }
 }

-source_set("manifests") {
-  sources = [
-    "//electron/shell/app/manifests.cc",
-    "//electron/shell/app/manifests.h",
-  ]
-
-  include_dirs = [ "//electron" ]
-
-  deps = [
-    "//electron/shell/common/api:mojo",
-    "//printing/buildflags",
-    "//services/service_manager/public/cpp",
-  ]
-}
-
 npm_action("electron_version_args") {
  script = "generate-version-json"

@@ -305,7 +293,7 @@ templated_file("electron_version_header") {
 action("electron_fuses") {
  script = "build/fuses/build.py"

-  inputs = [ "build/fuses/fuses.json" ]
+  inputs = [ "build/fuses/fuses.json5" ]

  outputs = [
    "$target_gen_dir/fuses.h",
@@ -328,7 +316,6 @@ source_set("electron_lib") {
    ":electron_fuses",
    ":electron_js2c",
    ":electron_version_header",
-    ":manifests",
    ":resources",
    "buildflags",
    "chromium_src:chrome",
@@ -345,6 +332,7 @@ source_set("electron_lib") {
    "//components/network_hints/common:mojo_bindings",
    "//components/network_hints/renderer",
    "//components/network_session_configurator/common",
+    "//components/os_crypt",
    "//components/pref_registry",
    "//components/prefs",
    "//components/upload_list",
@@ -353,7 +341,6 @@ source_set("electron_lib") {
    "//components/viz/service",
    "//content/public/browser",
    "//content/public/child",
-    "//content/public/common:service_names",
    "//content/public/gpu",
    "//content/public/renderer",
    "//content/public/utility",
@@ -419,7 +406,10 @@ source_set("electron_lib") {
  }

  if (!is_mas_build) {
-    deps += [ "//components/crash/core/app" ]
+    deps += [
+      "//components/crash/core/app",
+      "//components/crash/core/browser",
+    ]
  }

  sources = filenames.lib_sources
@@ -457,6 +447,7 @@ source_set("electron_lib") {
  if (is_mac) {
    deps += [
      "//components/remote_cocoa/app_shim",
+      "//components/remote_cocoa/browser",
      "//content/common:mac_helpers",
      "//ui/accelerated_widget_mac",
    ]
@@ -508,6 +499,7 @@ source_set("electron_lib") {
    }
  }
  if (is_linux) {
+    libs = [ "xshmfence" ]
    deps += [
      ":libnotify_loader",
      "//build/config/linux/gtk",
@@ -635,6 +627,9 @@ source_set("electron_lib") {
      "//chrome/services/printing/public/mojom",
      "//components/printing/common:mojo_interfaces",
    ]
+    if (is_mac) {
+      deps += [ "//chrome/services/mac_notifications/public/mojom" ]
+    }
  }

  if (enable_electron_extensions) {
@@ -648,6 +643,7 @@ source_set("electron_lib") {
      "//components/zoom",
      "//extensions/browser",
      "//extensions/browser:core_api_provider",
+      "//extensions/browser/updater",
      "//extensions/common",
      "//extensions/common:core_api_provider",
      "//extensions/renderer",
@@ -664,6 +660,7 @@ source_set("electron_lib") {
  }
  if (enable_pdf_viewer) {
    deps += [
+      "//chrome/browser/resources/pdf:resources",
      "//components/pdf/browser",
      "//components/pdf/renderer",
      "//pdf:pdf_ppapi",
@@ -683,6 +680,10 @@ source_set("electron_lib") {
    ]
    libs += [ "uxtheme.lib" ]
  }
+
+  if (allow_runtime_configurable_key_storage) {
+    defines += [ "ALLOW_RUNTIME_CONFIGURABLE_KEY_STORAGE" ]
+  }
 }

 electron_paks("packed_resources") {
@@ -1007,6 +1008,9 @@ if (is_mac) {
    deps = [
      ":electron_app_framework_bundle_data",
      ":electron_app_resources",
+      ":electron_fuses",
+      "//base",
+      "//electron/buildflags",
    ]
    if (is_mas_build) {
      deps += [ ":electron_login_helper_app" ]
@@ -1170,6 +1174,19 @@ if (is_mac) {
        ldflags += [ "/guard:cf,nolongjmp" ]
      }

+      if (current_cpu == "x86") {
+        # Set the initial stack size to 0.5MiB, instead of the 1.5MiB needed by
+        # Chrome's main thread. This saves significant memory on threads (like
+        # those in the Windows thread pool, and others) whose stack size we can
+        # only control through this setting. Because Chrome's main thread needs
+        # a minimum 1.5 MiB stack, the main thread (in 32-bit builds only) uses
+        # fibers to switch to a 1.5 MiB stack before running any other code.
+        ldflags += [ "/STACK:0x80000" ]
+      } else {
+        # Increase the initial stack size. The default is 1MB, this is 8MB.
+        ldflags += [ "/STACK:0x800000" ]
+      }
+
      # This is to support renaming of electron.exe. node-gyp has hard-coded
      # executable names which it will recognise as node. This module definition
      # file claims that the electron executable is in fact named "node.exe",
@@ -1283,13 +1300,18 @@ template("dist_zip") {
                             "testonly",
                           ])
    flatten = false
+    flatten_relative_to = false
    if (defined(invoker.flatten)) {
      flatten = invoker.flatten
+      if (defined(invoker.flatten_relative_to)) {
+        flatten_relative_to = invoker.flatten_relative_to
+      }
    }
    args = rebase_path(outputs + [ _runtime_deps_file ], root_build_dir) + [
             target_cpu,
             target_os,
             "$flatten",
+             "$flatten_relative_to",
           ]
  }
 }
@@ -1380,6 +1402,43 @@ dist_zip("hunspell_dictionaries_zip") {
  outputs = [ "$root_build_dir/hunspell_dictionaries.zip" ]
 }

+copy("libcxx_headers") {
+  sources = libcxx_headers + libcxx_licenses
+  outputs = [ "$target_gen_dir/electron_libcxx_include/{{source_root_relative_dir}}/{{source_file_part}}" ]
+}
+
+dist_zip("libcxx_headers_zip") {
+  data_deps = [ ":libcxx_headers" ]
+  flatten = true
+  flatten_relative_to = rebase_path(
+          "$target_gen_dir/electron_libcxx_include/buildtools/third_party/libc++/trunk",
+          "$root_out_dir")
+
+  outputs = [ "$root_build_dir/libcxx_headers.zip" ]
+}
+
+copy("libcxxabi_headers") {
+  sources = libcxxabi_headers + libcxxabi_licenses
+  outputs = [ "$target_gen_dir/electron_libcxxabi_include/{{source_root_relative_dir}}/{{source_file_part}}" ]
+}
+
+dist_zip("libcxxabi_headers_zip") {
+  data_deps = [ ":libcxxabi_headers" ]
+  flatten = true
+  flatten_relative_to = rebase_path(
+          "$target_gen_dir/electron_libcxxabi_include/buildtools/third_party/libc++abi/trunk",
+          "$root_out_dir")
+
+  outputs = [ "$root_build_dir/libcxxabi_headers.zip" ]
+}
+
+action("libcxx_objects_zip") {
+  deps = [ "//buildtools/third_party/libc++" ]
+  script = "build/zip_libcxx.py"
+  outputs = [ "$root_build_dir/libcxx_objects.zip" ]
+  args = rebase_path(outputs)
+}
+
 group("electron") {
  public_deps = [ ":electron_app" ]
 }
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -2,8 +2,8 @@

 As a member project of the OpenJS Foundation, Electron uses [Contributor Covenant v2.0](https://contributor-covenant.org/version/2/0/code_of_conduct) as their code of conduct. The full text is included [below](#contributor-covenant-code-of-conduct) in English, and translations are available from the Contributor Covenant organisation:

- [contributor-covenant.org/translations](https://www.contributor-covenant.org/translations)
- [github.com/ContributorCovenant](https://github.com/ContributorCovenant/contributor_covenant/tree/release/content/version/2/0)
+* [contributor-covenant.org/translations](https://www.contributor-covenant.org/translations)
+* [github.com/ContributorCovenant](https://github.com/ContributorCovenant/contributor_covenant/tree/release/content/version/2/0)

 ## Contributor Covenant Code of Conduct

--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -22,14 +22,14 @@ Issues are created [here](https://github.com/electron/electron/issues/new).

 ### Issue Closure

-Bug reports will be closed if the issue has been inactive and the latest affected version no longer receives support. At the moment, Electron maintains its three latest major versions, with a new major version being released every 12 weeks. (For more information on Electron's release cadence, see [this blog post](https://electronjs.org/blog/12-week-cadence).)
+Bug reports will be closed if the issue has been inactive and the latest affected version no longer receives support. At the moment, Electron maintains its three latest major versions, with a new major version being released every 8 weeks. (For more information on Electron's release cadence, see [this blog post](https://electronjs.org/blog/8-week-cadence).)

 _If an issue has been closed and you still feel it's relevant, feel free to ping a maintainer or add a comment!_

 ### Languages

 We accept issues in *any* language.
-When an issue is posted in a language besides English, it is acceptable and encouraged to post an English-translated copy as a reply. 
+When an issue is posted in a language besides English, it is acceptable and encouraged to post an English-translated copy as a reply.
 Anyone may post the translated reply.
 In most cases, a quick pass through translation software is sufficient.
 Having the original text _as well as_ the translation can help mitigate translation errors.
@@ -66,5 +66,5 @@ See [Coding Style](https://electronjs.org/docs/development/coding-style) for inf

 ## Further Reading

-For more in-depth guides on developing Electron, see 
+For more in-depth guides on developing Electron, see
 [/docs/development](/docs/development/README.md)
--- a/45
+++ b/45
@@ -10,25 +10,24 @@ gclient_gn_args = [
  'checkout_openxr',
  'checkout_google_benchmark',
  'mac_xcode_version',
+  'generate_location_tags',
 ]

 vars = {
  'chromium_version':
-    '3a75ada69d1ac06d6903a2c981ab90a8162f1ba0',
+    '91.0.4472.164',
  'node_version':
-    'v14.15.1',
+    'v14.16.0',
  'nan_version':
-    '2c4ee8a32a299eada3cd6e468bbd0a473bfea96d',
+    'v2.14.2',
  'squirrel.mac_version':
-    'a3a5b3f03b824441c014893b18f99a103b2603e9',
+    '0e5d146ba13101a1302d59ea6e6e0b3cace4ae38',

  'pyyaml_version': '3.12',
-  'requests_version': 'e4d59bedfd3c7f4f254f4f5d036587bcd8152458',

  'chromium_git': 'https://chromium.googlesource.com',
  'electron_git': 'https://github.com/electron',
  'nodejs_git': 'https://github.com/nodejs',
-  'requests_git': 'https://github.com/kennethreitz',
  'yaml_git': 'https://github.com/yaml',
  'squirrel_git': 'https://github.com/Squirrel',

@@ -50,18 +49,15 @@ vars = {
  # It's only needed to parse the native tests configurations.
  'checkout_pyyaml': False,

-  # Python "requests" module is used for releases only.
-  'checkout_requests': False,
+  'use_rts': False,

  'mac_xcode_version': 'default',

+  'generate_location_tags': False,
+
  # To allow running hooks without parsing the DEPS tree
  'process_deps': True,

-  # It is always needed for normal Electron builds,
-  # but might be impossible for custom in-house builds.
-  'download_external_binaries': True,
-
  'checkout_nacl':
    False,
  'checkout_libaom':
@@ -99,10 +95,6 @@ deps = {
    'url': (Var("yaml_git")) + '/pyyaml.git@' + (Var("pyyaml_version")),
    'condition': 'checkout_pyyaml and process_deps',
  },
-  'src/electron/vendor/requests': {
-    'url': Var('requests_git') + '/requests.git' + '@' +  Var('requests_version'),
-    'condition': 'checkout_requests and process_deps',
-  },
  'src/third_party/squirrel.mac': {
    'url': Var("squirrel_git") + '/Squirrel.Mac.git@' + Var("squirrel.mac_version"),
    'condition': 'process_deps',
@@ -157,32 +149,13 @@ hooks = [
      'src/electron/patches/mtime-cache.json',
    ],
  },
-  {
-    'name': 'electron_external_binaries',
-    'pattern': 'src/electron/script/update-external-binaries.py',
-    'condition': 'download_external_binaries',
-    'action': [
-      'python3',
-      'src/electron/script/update-external-binaries.py',
-    ],
-  },
  {
    'name': 'electron_npm_deps',
    'pattern': 'src/electron/package.json',
    'action': [
      'python3',
      '-c',
-      'import os, subprocess; os.chdir(os.path.join("src", "electron")); subprocess.check_call(["python", "script/lib/npx.py", "yarn@' + (Var("yarn_version")) + '", "install", "--frozen-lockfile"]);',
-    ],
-  },
-  {
-    'name': 'setup_requests',
-    'pattern': 'src/electron',
-    'condition': 'checkout_requests and process_deps',
-    'action': [
-      'python3',
-      '-c',
-      'import os, subprocess; os.chdir(os.path.join("src", "electron", "vendor", "requests")); subprocess.check_call(["python", "setup.py", "build"]);',
+      'import os, subprocess; os.chdir(os.path.join("src", "electron")); subprocess.check_call(["python3", "script/lib/npx.py", "yarn@' + (Var("yarn_version")) + '", "install", "--frozen-lockfile"]);',
    ],
  },
 ]
--- a/2
+++ b/2
@@ -1 +1 @@
-12.0.0-nightly.20201118
+13.2.1
--- a/1
+++ b/1
@@ -1,3 +1,4 @@
+Copyright (c) Electron contributors
 Copyright (c) 2013-2020 GitHub Inc.

 Permission is hereby granted, free of charge, to any person obtaining
--- a/README.md
+++ b/README.md
@@ -1,12 +1,11 @@
 [![Electron Logo](https://electronjs.org/images/electron-logo.svg)](https://electronjs.org)

-
 [![CircleCI Build Status](https://circleci.com/gh/electron/electron/tree/master.svg?style=shield)](https://circleci.com/gh/electron/electron/tree/master)
 [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/4lggi9dpjc1qob7k/branch/master?svg=true)](https://ci.appveyor.com/project/electron-bot/electron-ljo26/branch/master)
 [![devDependency Status](https://david-dm.org/electron/electron/dev-status.svg)](https://david-dm.org/electron/electron?type=dev)
 [![Electron Discord Invite](https://img.shields.io/discord/745037351163527189?color=%237289DA&label=chat&logo=discord&logoColor=white)](https://discord.com/invite/electron)

-:memo: Available Translations: 🇨🇳 🇹🇼 🇧🇷 🇪🇸 🇰🇷 🇯🇵 🇷🇺 🇫🇷 🇹🇭 🇳🇱 🇹🇷 🇮🇩 🇺🇦 🇨🇿 🇮🇹 🇵🇱.
+:memo: Available Translations: 🇨🇳 🇧🇷 🇪🇸 🇯🇵 🇷🇺 🇫🇷 🇺🇸 🇩🇪.
 View these docs in other languages at [electron/i18n](https://github.com/electron/i18n/tree/master/content/).

 The Electron framework lets you write cross-platform desktop applications
@@ -29,15 +28,12 @@ The preferred method is to install Electron as a development dependency in your
 app:

 ```sh
-npm install electron --save-dev [--save-exact]
+npm install electron --save-dev
 ```

-The `--save-exact` flag is recommended for Electron prior to version 2, as it does not follow semantic
-versioning. As of version 2.0.0, Electron follows semver, so you don't need `--save-exact` flag. For info on how to manage Electron versions in your apps, see
-[Electron versioning](docs/tutorial/electron-versioning.md).
-
 For more installation options and troubleshooting tips, see
-[installation](docs/tutorial/installation.md).
+[installation](docs/tutorial/installation.md). For info on how to manage Electron versions in your apps, see
+[Electron versioning](docs/tutorial/electron-versioning.md).

 ## Quick start & Electron Fiddle

--- a/SECURITY.md
+++ b/SECURITY.md
@@ -13,4 +13,5 @@ Report security bugs in third-party modules to the person or team maintaining th
 For context on Electron's security notification process, please see the [Notifications](https://github.com/electron/governance/blob/master/wg-security/membership-and-notifications.md#notifications) section of the Security WG's [Membership and Notifications](https://github.com/electron/governance/blob/master/wg-security/membership-and-notifications.md) Governance document.

 ## Learning More About Security
+
 To learn more about securing an Electron application, please see the [security tutorial](docs/tutorial/security.md).
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -36,6 +36,7 @@ environment:
  ELECTRON_ENABLE_STACK_DUMPING: 1
  MOCHA_REPORTER: mocha-multi-reporters
  MOCHA_MULTI_REPORTERS: mocha-appveyor-reporter, tap
+  GOMA_FALLBACK_ON_AUTH_FAILURE: true
 notifications:
  - provider: Webhook
    url: https://electron-mission-control.herokuapp.com/rest/appveyor-hook
@@ -67,9 +68,7 @@ build_script:
  - ps: Move-Item $env:APPVEYOR_BUILD_FOLDER -Destination src\electron
  - ps: $env:CHROMIUM_BUILDTOOLS_PATH="$pwd\src\buildtools"
  - ps: >-
-      if ($env:GN_CONFIG -eq 'release') {
-        $env:GCLIENT_EXTRA_ARGS="$env:GCLIENT_EXTRA_ARGS --custom-var=checkout_requests=True"
-      } else {
+      if ($env:GN_CONFIG -ne 'release') {
        $env:NINJA_STATUS="[%r processes, %f/%t @ %o/s : %es] "
      }
  - >-
@@ -98,8 +97,6 @@ build_script:
              $env:SAVE_GCLIENT_SRC="true"
            }
          } else {
-            # update external binaries
-            python src/electron/script/update-external-binaries.py
            # update angle
            cd src\third_party\angle
            git remote set-url origin  https://chromium.googlesource.com/angle/angle.git
@@ -141,7 +138,8 @@ build_script:
  - cd build-tools
  - npm install
  - mkdir third_party
-  - node -e "require('./src/utils/goma.js').downloadAndPrepare()"
+  - ps: >-
+      node -e "require('./src/utils/goma.js').downloadAndPrepare({ gomaOneForAll: true })"
  - ps: $env:GN_GOMA_FILE = node -e "console.log(require('./src/utils/goma.js').gnFilePath)"
  - ps: $env:LOCAL_GOMA_DIR = node -e "console.log(require('./src/utils/goma.js').dir)"
  - cd ..
@@ -151,7 +149,6 @@ build_script:
  - gn gen out/Default "--args=import(\"%BUILD_CONFIG_PATH%\") import(\"%GN_GOMA_FILE%\") %GN_EXTRA_ARGS% "
  - gn check out/Default //electron:electron_lib
  - gn check out/Default //electron:electron_app
-  - gn check out/Default //electron:manifests
  - gn check out/Default //electron/shell/common/api:mojo
  - if DEFINED GN_GOMA_FILE (ninja -j 300 -C out/Default electron:electron_app) else (ninja -C out/Default electron:electron_app)
  - if "%GN_CONFIG%"=="testing" ( python C:\depot_tools\post_build_ninja_summary.py -C out\Default )
--- a/azure-pipelines-arm.yml
+++ b/azure-pipelines-arm.yml
@@ -17,6 +17,7 @@ steps:
    node script/download-circleci-artifacts.js --buildNum=$CIRCLE_BUILD_NUM --name=dist.zip --dest=$ZIP_DEST
    cd $ZIP_DEST
    unzip -o dist.zip
+    xattr -cr Electron.app    
  displayName: 'Download and unzip dist files for test'
  env:
    CIRCLE_TOKEN: $(CIRCLECI_TOKEN)
@@ -48,38 +49,44 @@ steps:
   mkdir -p $CROSS_ARCH_SNAPSHOTS
   cd src/electron
   node script/download-circleci-artifacts.js --buildNum=$CIRCLE_BUILD_NUM --name=cross-arch-snapshots/snapshot_blob.bin --dest=$CROSS_ARCH_SNAPSHOTS
-   node script/download-circleci-artifacts.js --buildNum=$CIRCLE_BUILD_NUM --name=cross-arch-snapshots/v8_context_snapshot.bin --dest=$CROSS_ARCH_SNAPSHOTS
+   node script/download-circleci-artifacts.js --buildNum=$CIRCLE_BUILD_NUM --name=cross-arch-snapshots/v8_context_snapshot.arm64.bin --dest=$CROSS_ARCH_SNAPSHOTS
  displayName: 'Download cross arch snapshot files'
  env:
    CIRCLE_TOKEN: $(CIRCLECI_TOKEN)

- bash: |
-   export NATIVE_UNITTESTS_DEST=$PWD/src/out/Default
-   cd src/electron
-   node script/download-circleci-artifacts.js --buildNum=$CIRCLE_BUILD_NUM --name=shell_browser_ui_unittests --dest=$NATIVE_UNITTESTS_DEST
-   chmod +x $NATIVE_UNITTESTS_DEST/shell_browser_ui_unittests
-  displayName: 'Download native unittest executables'
-  env:
-    CIRCLE_TOKEN: $(CIRCLECI_TOKEN)
-
 - bash: |
    cd src
    export ELECTRON_OUT_DIR=Default
-    set npm_config_arch=arm64
-    (cd electron && node script/yarn test -- --enable-logging)
-  displayName: 'Run Electron tests'
+    export npm_config_arch=arm64
+    (cd electron && node script/yarn test --enable-logging --runners main)
+  displayName: 'Run Electron main tests'
  timeoutInMinutes: 20
  env:
    ELECTRON_DISABLE_SECURITY_WARNINGS: 1
    IGNORE_YARN_INSTALL_ERROR: 1
    ELECTRON_TEST_RESULTS_DIR: junit

+- bash: |
+    cd src
+    export ELECTRON_OUT_DIR=Default
+    export npm_config_arch=arm64
+    (cd electron && node script/yarn test --enable-logging --runners remote)
+  displayName: 'Run Electron remote tests'
+  timeoutInMinutes: 20
+  condition: succeededOrFailed()
+  env:
+    ELECTRON_DISABLE_SECURITY_WARNINGS: 1
+    IGNORE_YARN_INSTALL_ERROR: 1
+    ELECTRON_TEST_RESULTS_DIR: junit
+
 - bash: |
    cd src
    python electron/script/verify-ffmpeg.py --source-root "$PWD" --build-dir out/Default --ffmpeg-path out/ffmpeg
  displayName: Verify non proprietary ffmpeg
  timeoutInMinutes: 5
  condition: succeededOrFailed()
+  env:
+    TARGET_ARCH: arm64

 - bash: |
    cd src
@@ -98,6 +105,16 @@ steps:

  condition: succeededOrFailed()

+- bash: killall Electron || echo "No Electron processes left running"
+  displayName: 'Kill processes left running from last test run'
+  condition: always()
+
+- bash: |
+    rm -rf ~/Library/Application\ Support/Electron*
+    rm -rf ~/Library/Application\ Support/electron*
+  displayName: 'Delete user app data directories'
+  condition: always()
+
 - task: mspremier.PostBuildCleanup.PostBuildCleanup-task.PostBuildCleanup@3
  displayName: 'Clean Agent Directories'

--- a/azure-pipelines-woa.yml
+++ b/azure-pipelines-woa.yml
@@ -64,7 +64,7 @@ steps:
    set npm_config_arch=arm64
    cd electron
    # CalculateNativeWinOcclusion is disabled due to https://bugs.chromium.org/p/chromium/issues/detail?id=1139022
-    node script/yarn test -- --enable-logging --verbose --disable-features=CalculateNativeWinOcclusion
+    node script/yarn test -- --enable-logging --verbose --disable-features=CalculateNativeWinOcclusion --disable-gpu
  displayName: 'Run Electron tests'
  env:
    ELECTRON_OUT_DIR: Default
@@ -93,6 +93,6 @@ steps:
  condition: always()

 - powershell: |
-    Remove-Item -path $env:APPDATA/Electron* -Recurse
+    Remove-Item -path $env:APPDATA/Electron* -Recurse -Force -ErrorAction Ignore
  displayName: 'Delete user app data directories'
  condition: always()
--- a/build/args/all.gn
+++ b/build/args/all.gn
@@ -2,7 +2,7 @@ is_electron_build = true
 root_extra_deps = [ "//electron" ]

 # Registry of NMVs --> https://github.com/nodejs/node/blob/master/doc/abi_version_registry.json
-node_module_version = 87
+node_module_version = 89

 v8_promise_internal_field_count = 1
 v8_typed_array_max_size_in_heap = 0
@@ -19,4 +19,17 @@ enable_basic_printing = true
 angle_enable_vulkan_validation_layers = false
 dawn_enable_vulkan_validation_layers = false

+# This breaks native node modules
+libcxx_abi_unstable = false
+
+# These are disabled because they cause the zip manifest to differ between
+# testing and release builds.
+# See https://chromium-review.googlesource.com/c/chromium/src/+/2774898.
+enable_pseudolocales = false
+
 is_cfi = false
+
+# Make application name configurable at runtime for cookie crypto
+allow_runtime_configurable_key_storage = true
+
+enable_cet_shadow_stack = false
--- a/build/fuses/build.py
+++ b/build/fuses/build.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3

+from collections import OrderedDict
 import json
 import os
 import sys
@@ -49,8 +50,8 @@ const volatile char kFuseWire[] = { /* sentinel */ {sentinel}, /* fuse_version *
 }
 """

-with open(os.path.join(dir_path, "fuses.json"), 'r') as f:
-  fuse_defaults = json.load(f)
+with open(os.path.join(dir_path, "fuses.json5"), 'r') as f:
+  fuse_defaults = json.loads(''.join(line for line in f.readlines() if not line.strip()[0] == "/"), object_pairs_hook=OrderedDict)

 fuse_version = fuse_defaults['_version']
 del fuse_defaults['_version']
--- a/build/fuses/fuses.json5
+++ b/build/fuses/fuses.json5
@@ -2,5 +2,6 @@
  "_comment": "Modifying the fuse schema in any breaking way should result in the _version prop being incremented.  NEVER remove a fuse or change its meaning, instead mark it as removed with 'r'",
  "_schema": "0 == off, 1 == on, r == removed fuse",
  "_version": 1,
-  "run_as_node": "1"
+  "run_as_node": "1",
+  "cookie_encryption": "0"
 }
--- a/build/install-build-deps.sh
+++ b/build/install-build-deps.sh
@@ -1,653 +0,0 @@
-#!/bin/bash -e
-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-# Script to install everything needed to build chromium (well, ideally, anyway)
-# See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_build_instructions.md
-usage() {
-  echo "Usage: $0 [--options]"
-  echo "Options:"
-  echo "--[no-]syms: enable or disable installation of debugging symbols"
-  echo "--lib32: enable installation of 32-bit libraries, e.g. for V8 snapshot"
-  echo "--[no-]arm: enable or disable installation of arm cross toolchain"
-  echo "--[no-]chromeos-fonts: enable or disable installation of Chrome OS"\
-       "fonts"
-  echo "--[no-]nacl: enable or disable installation of prerequisites for"\
-       "building standalone NaCl and all its toolchains"
-  echo "--[no-]backwards-compatible: enable or disable installation of packages
-        that are no longer currently needed and have been removed from this
-        script.  Useful for bisection."
-  echo "--no-prompt: silently select standard options/defaults"
-  echo "--quick-check: quickly try to determine if dependencies are installed"
-  echo "               (this avoids interactive prompts and sudo commands,"
-  echo "               so might not be 100% accurate)"
-  echo "--unsupported: attempt installation even on unsupported systems"
-  echo "Script will prompt interactively if options not given."
-  exit 1
-}
-# Checks whether a particular package is available in the repos.
-# USAGE: $ package_exists <package name>
-package_exists() {
-  # 'apt-cache search' takes a regex string, so eg. the +'s in packages like
-  # "libstdc++" need to be escaped.
-  local escaped="$(echo $1 | sed 's/[\~\+\.\:-]/\\&/g')"
-  [ ! -z "$(apt-cache search --names-only "${escaped}" | \
-            awk '$1 == "'$1'" { print $1; }')" ]
-}
-# These default to on because (some) bots need them and it keeps things
-# simple for the bot setup if all bots just run the script in its default
-# mode.  Developers who don't want stuff they don't need installed on their
-# own workstations can pass --no-arm --no-nacl when running the script.
-do_inst_arm=1
-do_inst_nacl=1
-while [ "$1" != "" ]
-do
-  case "$1" in
-  --syms)                    do_inst_syms=1;;
-  --no-syms)                 do_inst_syms=0;;
-  --lib32)                   do_inst_lib32=1;;
-  --arm)                     do_inst_arm=1;;
-  --no-arm)                  do_inst_arm=0;;
-  --chromeos-fonts)          do_inst_chromeos_fonts=1;;
-  --no-chromeos-fonts)       do_inst_chromeos_fonts=0;;
-  --nacl)                    do_inst_nacl=1;;
-  --no-nacl)                 do_inst_nacl=0;;
-  --backwards-compatible)    do_inst_backwards_compatible=1;;
-  --no-backwards-compatible) do_inst_backwards_compatible=0;;
-  --add-cross-tool-repo)     add_cross_tool_repo=1;;
-  --no-prompt)               do_default=1
-                             do_quietly="-qq --assume-yes"
-    ;;
-  --quick-check)             do_quick_check=1;;
-  --unsupported)             do_unsupported=1;;
-  *) usage;;
-  esac
-  shift
-done
-if [ "$do_inst_arm" = "1" ]; then
-  do_inst_lib32=1
-fi
-# Check for lsb_release command in $PATH
-if ! which lsb_release > /dev/null; then
-  echo "ERROR: lsb_release not found in \$PATH" >&2
-  exit 1;
-fi
-distro_codename=$(lsb_release --codename --short)
-distro_id=$(lsb_release --id --short)
-supported_codenames="(trusty|xenial|artful|bionic)"
-supported_ids="(Debian)"
-if [ 0 -eq "${do_unsupported-0}" ] && [ 0 -eq "${do_quick_check-0}" ] ; then
-  if [[ ! $distro_codename =~ $supported_codenames &&
-        ! $distro_id =~ $supported_ids ]]; then
-    echo -e "ERROR: The only supported distros are\n" \
-      "\tUbuntu 14.04 LTS (trusty)\n" \
-      "\tUbuntu 16.04 LTS (xenial)\n" \
-      "\tUbuntu 17.10 (artful)\n" \
-      "\tUbuntu 18.04 LTS (bionic)\n" \
-      "\tDebian 8 (jessie) or later" >&2
-    exit 1
-  fi
-  if ! uname -m | egrep -q "i686|x86_64"; then
-    echo "Only x86 architectures are currently supported" >&2
-    exit
-  fi
-fi
-if [ "x$(id -u)" != x0 ] && [ 0 -eq "${do_quick_check-0}" ]; then
-  echo "Running as non-root user."
-  echo "You might have to enter your password one or more times for 'sudo'."
-  echo
-fi
-# Packages needed for chromeos only
-chromeos_dev_list="libbluetooth-dev libxkbcommon-dev"
-if package_exists realpath; then
-  chromeos_dev_list="${chromeos_dev_list} realpath"
-fi
-# Packages needed for development
-dev_list="\
-  binutils
-  bison
-  bzip2
-  cdbs
-  curl
-  dbus-x11
-  dpkg-dev
-  elfutils
-  devscripts
-  fakeroot
-  flex
-  g++
-  git-core
-  git-svn
-  gperf
-  libappindicator3-dev
-  libasound2-dev
-  libatspi2.0-dev
-  libbrlapi-dev
-  libbz2-dev
-  libcairo2-dev
-  libcap-dev
-  libcups2-dev
-  libcurl4-gnutls-dev
-  libdrm-dev
-  libelf-dev
-  libffi-dev
-  libgbm-dev
-  libglib2.0-dev
-  libglu1-mesa-dev
-  libgnome-keyring-dev
-  libgtk-3-dev
-  libkrb5-dev
-  libnspr4-dev
-  libnss3-dev
-  libpam0g-dev
-  libpci-dev
-  libpulse-dev
-  libsctp-dev
-  libspeechd-dev
-  libsqlite3-dev
-  libssl-dev
-  libudev-dev
-  libwww-perl
-  libxslt1-dev
-  libxss-dev
-  libxt-dev
-  libxtst-dev
-  locales
-  openbox
-  p7zip
-  patch
-  perl
-  pkg-config
-  python
-  python-cherrypy3
-  python-crypto
-  python-dev
-  python-numpy
-  python-opencv
-  python-openssl
-  python-psutil
-  python-yaml
-  rpm
-  ruby
-  subversion
-  uuid-dev
-  wdiff
-  x11-utils
-  xcompmgr
-  xz-utils
-  zip
-  $chromeos_dev_list
-"
-# 64-bit systems need a minimum set of 32-bit compat packages for the pre-built
-# NaCl binaries.
-if file -L /sbin/init | grep -q 'ELF 64-bit'; then
-  dev_list="${dev_list} libc6-i386 lib32gcc1 lib32stdc++6"
-fi
-# Run-time libraries required by chromeos only
-chromeos_lib_list="libpulse0 libbz2-1.0"
-# List of required run-time libraries
-common_lib_list="\
-  libappindicator3-1
-  libasound2
-  libatk1.0-0
-  libatspi2.0-0
-  libc6
-  libcairo2
-  libcap2
-  libcups2
-  libexpat1
-  libffi6
-  libfontconfig1
-  libfreetype6
-  libglib2.0-0
-  libgnome-keyring0
-  libgtk-3-0
-  libpam0g
-  libpango1.0-0
-  libpci3
-  libpcre3
-  libpixman-1-0
-  libspeechd2
-  libstdc++6
-  libsqlite3-0
-  libuuid1
-  libwayland-egl1-mesa
-  libx11-6
-  libx11-xcb1
-  libxau6
-  libxcb1
-  libxcomposite1
-  libxcursor1
-  libxdamage1
-  libxdmcp6
-  libxext6
-  libxfixes3
-  libxi6
-  libxinerama1
-  libxrandr2
-  libxrender1
-  libxtst6
-  zlib1g
-"
-# Full list of required run-time libraries
-lib_list="\
-  $common_lib_list
-  $chromeos_lib_list
-"
-# 32-bit libraries needed e.g. to compile V8 snapshot for Android or armhf
-lib32_list="linux-libc-dev:i386 libpci3:i386"
-# 32-bit libraries needed for a 32-bit build
-lib32_list="$lib32_list libx11-xcb1:i386"
-# Packages that have been removed from this script.  Regardless of configuration
-# or options passed to this script, whenever a package is removed, it should be
-# added here.
-backwards_compatible_list="\
-  7za
-  fonts-indic
-  fonts-ipafont
-  fonts-stix
-  fonts-thai-tlwg
-  fonts-tlwg-garuda
-  language-pack-da
-  language-pack-fr
-  language-pack-he
-  language-pack-zh-hant
-  libappindicator-dev
-  libappindicator1
-  libappindicator3-1:i386
-  libexif-dev
-  libexif12
-  libexif12:i386
-  libgbm-dev
-  libgl1-mesa-dev
-  libgl1-mesa-glx:i386
-  libgles2-mesa-dev
-  libgtk2.0-0
-  libgtk2.0-0:i386
-  libgtk2.0-dev
-  mesa-common-dev
-  msttcorefonts
-  ttf-dejavu-core
-  ttf-indic-fonts
-  ttf-kochi-gothic
-  ttf-kochi-mincho
-  ttf-mscorefonts-installer
-  xfonts-mathml
-"
-case $distro_codename in
-  trusty)
-    backwards_compatible_list+=" \
-      libgbm-dev-lts-trusty
-      libgl1-mesa-dev-lts-trusty
-      libgl1-mesa-glx-lts-trusty:i386
-      libgles2-mesa-dev-lts-trusty
-      mesa-common-dev-lts-trusty"
-    ;;
-  xenial)
-    backwards_compatible_list+=" \
-      libgbm-dev-lts-xenial
-      libgl1-mesa-dev-lts-xenial
-      libgl1-mesa-glx-lts-xenial:i386
-      libgles2-mesa-dev-lts-xenial
-      mesa-common-dev-lts-xenial"
-    ;;
-esac
-# arm cross toolchain packages needed to build chrome on armhf
-EM_REPO="deb http://emdebian.org/tools/debian/ jessie main"
-EM_SOURCE=$(cat <<EOF
-# Repo added by Chromium $0
-${EM_REPO}
-# deb-src http://emdebian.org/tools/debian/ jessie main
-EOF
-)
-EM_ARCHIVE_KEY_FINGER="084C6C6F39159EDB67969AA87DE089671804772E"
-GPP_ARM_PACKAGE="g++-arm-linux-gnueabihf"
-case $distro_codename in
-  jessie)
-    eval $(apt-config shell APT_SOURCESDIR 'Dir::Etc::sourceparts/d')
-    CROSSTOOLS_LIST="${APT_SOURCESDIR}/crosstools.list"
-    arm_list="libc6-dev:armhf
-              linux-libc-dev:armhf"
-    if [ "$do_inst_arm" = "1" ]; then
-      if $(dpkg-query -W ${GPP_ARM_PACKAGE} &>/dev/null); then
-        arm_list+=" ${GPP_ARM_PACKAGE}"
-      else
-        if [ "${add_cross_tool_repo}" = "1" ]; then
-          gpg --keyserver pgp.mit.edu --recv-keys ${EM_ARCHIVE_KEY_FINGER}
-          gpg -a --export ${EM_ARCHIVE_KEY_FINGER} | sudo apt-key add -
-          if ! grep "^${EM_REPO}" "${CROSSTOOLS_LIST}" &>/dev/null; then
-            echo "${EM_SOURCE}" | sudo tee -a "${CROSSTOOLS_LIST}" >/dev/null
-          fi
-          arm_list+=" ${GPP_ARM_PACKAGE}"
-        else
-          echo "The Debian Cross-toolchains repository is necessary to"
-          echo "cross-compile Chromium for arm."
-          echo "Rerun with --add-deb-cross-tool-repo to have it added for you."
-        fi
-      fi
-    fi
-    ;;
-  # All necessary ARM packages are available on the default repos on
-  # Debian 9 and later.
-  *)
-    arm_list="libc6-dev-armhf-cross
-              linux-libc-dev-armhf-cross
-              ${GPP_ARM_PACKAGE}"
-    ;;
-esac
-# Work around for dependency issue Ubuntu/Trusty: http://crbug.com/435056
-case $distro_codename in
-  trusty)
-    arm_list+=" g++-4.8-multilib-arm-linux-gnueabihf
-                gcc-4.8-multilib-arm-linux-gnueabihf"
-    ;;
-  xenial|artful|bionic)
-    arm_list+=" g++-5-multilib-arm-linux-gnueabihf
-                gcc-5-multilib-arm-linux-gnueabihf
-                gcc-arm-linux-gnueabihf"
-    ;;
-esac
-# Packages to build NaCl, its toolchains, and its ports.
-naclports_list="ant autoconf bison cmake gawk intltool xutils-dev xsltproc"
-nacl_list="\
-  g++-mingw-w64-i686
-  lib32z1-dev
-  libasound2:i386
-  libcap2:i386
-  libelf-dev:i386
-  libfontconfig1:i386
-  libglib2.0-0:i386
-  libgpm2:i386
-  libgtk-3-0:i386
-  libncurses5:i386
-  lib32ncurses5-dev
-  libnss3:i386
-  libpango1.0-0:i386
-  libssl-dev:i386
-  libtinfo-dev
-  libtinfo-dev:i386
-  libtool
-  libuuid1:i386
-  libxcomposite1:i386
-  libxcursor1:i386
-  libxdamage1:i386
-  libxi6:i386
-  libxrandr2:i386
-  libxss1:i386
-  libxtst6:i386
-  texinfo
-  xvfb
-  ${naclports_list}
-"
-if package_exists libssl1.1; then
-  nacl_list="${nacl_list} libssl1.1:i386"
-elif package_exists libssl1.0.2; then
-  nacl_list="${nacl_list} libssl1.0.2:i386"
-else
-  nacl_list="${nacl_list} libssl1.0.0:i386"
-fi
-# Some package names have changed over time
-if package_exists libpng16-16; then
-  lib_list="${lib_list} libpng16-16"
-else
-  lib_list="${lib_list} libpng12-0"
-fi
-if package_exists libnspr4; then
-  lib_list="${lib_list} libnspr4 libnss3"
-else
-  lib_list="${lib_list} libnspr4-0d libnss3-1d"
-fi
-if package_exists libjpeg-dev; then
-  dev_list="${dev_list} libjpeg-dev"
-else
-  dev_list="${dev_list} libjpeg62-dev"
-fi
-if package_exists libudev1; then
-  dev_list="${dev_list} libudev1"
-  nacl_list="${nacl_list} libudev1:i386"
-else
-  dev_list="${dev_list} libudev0"
-  nacl_list="${nacl_list} libudev0:i386"
-fi
-if package_exists libbrlapi0.6; then
-  dev_list="${dev_list} libbrlapi0.6"
-else
-  dev_list="${dev_list} libbrlapi0.5"
-fi
-if package_exists apache2.2-bin; then
-  dev_list="${dev_list} apache2.2-bin"
-else
-  dev_list="${dev_list} apache2-bin"
-fi
-if package_exists libav-tools; then
-  dev_list="${dev_list} libav-tools"
-fi
-if package_exists php7.2-cgi; then
-  dev_list="${dev_list} php7.2-cgi libapache2-mod-php7.2"
-elif package_exists php7.1-cgi; then
-  dev_list="${dev_list} php7.1-cgi libapache2-mod-php7.1"
-elif package_exists php7.0-cgi; then
-  dev_list="${dev_list} php7.0-cgi libapache2-mod-php7.0"
-else
-  dev_list="${dev_list} php5-cgi libapache2-mod-php5"
-fi
-# Some packages are only needed if the distribution actually supports
-# installing them.
-if package_exists appmenu-gtk; then
-  lib_list="$lib_list appmenu-gtk"
-fi
-# Cross-toolchain strip is needed for building the sysroots.
-if package_exists binutils-arm-linux-gnueabihf; then
-  dev_list="${dev_list} binutils-arm-linux-gnueabihf"
-fi
-if package_exists binutils-aarch64-linux-gnu; then
-  dev_list="${dev_list} binutils-aarch64-linux-gnu"
-fi
-if package_exists binutils-mipsel-linux-gnu; then
-  dev_list="${dev_list} binutils-mipsel-linux-gnu"
-fi
-if package_exists binutils-mips64el-linux-gnuabi64; then
-  dev_list="${dev_list} binutils-mips64el-linux-gnuabi64"
-fi
-# When cross building for arm/Android on 64-bit systems the host binaries
-# that are part of v8 need to be compiled with -m32 which means
-# that basic multilib support is needed.
-if file -L /sbin/init | grep -q 'ELF 64-bit'; then
-  # gcc-multilib conflicts with the arm cross compiler (at least in trusty) but
-  # g++-X.Y-multilib gives us the 32-bit support that we need. Find out the
-  # appropriate value of X and Y by seeing what version the current
-  # distribution's g++-multilib package depends on.
-  multilib_package=$(apt-cache depends g++-multilib --important | \
-      grep -E --color=never --only-matching '\bg\+\+-[0-9.]+-multilib\b')
-  lib32_list="$lib32_list $multilib_package"
-fi
-if [ "$do_inst_syms" = "1" ]; then
-  echo "Including debugging symbols."
-  # Debian is in the process of transitioning to automatic debug packages, which
-  # have the -dbgsym suffix (https://wiki.debian.org/AutomaticDebugPackages).
-  # Untransitioned packages have the -dbg suffix.  And on some systems, neither
-  # will be available, so exclude the ones that are missing.
-  dbg_package_name() {
-    if package_exists "$1-dbgsym"; then
-      echo "$1-dbgsym"
-    elif package_exists "$1-dbg"; then
-      echo "$1-dbg"
-    fi
-  }
-  for package in "${common_lib_list}"; do
-    dbg_list="$dbg_list $(dbg_package_name ${package})"
-  done
-  # Debugging symbols packages not following common naming scheme
-  if [ "$(dbg_package_name libstdc++6)" == "" ]; then
-    if package_exists libstdc++6-8-dbg; then
-      dbg_list="${dbg_list} libstdc++6-8-dbg"
-    elif package_exists libstdc++6-7-dbg; then
-      dbg_list="${dbg_list} libstdc++6-7-dbg"
-    elif package_exists libstdc++6-6-dbg; then
-      dbg_list="${dbg_list} libstdc++6-6-dbg"
-    elif package_exists libstdc++6-5-dbg; then
-      dbg_list="${dbg_list} libstdc++6-5-dbg"
-    elif package_exists libstdc++6-4.9-dbg; then
-      dbg_list="${dbg_list} libstdc++6-4.9-dbg"
-    elif package_exists libstdc++6-4.8-dbg; then
-      dbg_list="${dbg_list} libstdc++6-4.8-dbg"
-    elif package_exists libstdc++6-4.7-dbg; then
-      dbg_list="${dbg_list} libstdc++6-4.7-dbg"
-    elif package_exists libstdc++6-4.6-dbg; then
-      dbg_list="${dbg_list} libstdc++6-4.6-dbg"
-    fi
-  fi
-  if [ "$(dbg_package_name libatk1.0-0)" == "" ]; then
-    dbg_list="$dbg_list $(dbg_package_name libatk1.0)"
-  fi
-  if [ "$(dbg_package_name libpango1.0-0)" == "" ]; then
-    dbg_list="$dbg_list $(dbg_package_name libpango1.0-dev)"
-  fi
-else
-  echo "Skipping debugging symbols."
-  dbg_list=
-fi
-if [ "$do_inst_lib32" = "1" ]; then
-  echo "Including 32-bit libraries."
-else
-  echo "Skipping 32-bit libraries."
-  lib32_list=
-fi
-if [ "$do_inst_arm" = "1" ]; then
-  echo "Including ARM cross toolchain."
-else
-  echo "Skipping ARM cross toolchain."
-  arm_list=
-fi
-if [ "$do_inst_nacl" = "1" ]; then
-  echo "Including NaCl, NaCl toolchain, NaCl ports dependencies."
-else
-  echo "Skipping NaCl, NaCl toolchain, NaCl ports dependencies."
-  nacl_list=
-fi
-filtered_backwards_compatible_list=
-if [ "$do_inst_backwards_compatible" = "1" ]; then
-  echo "Including backwards compatible packages."
-  for package in ${backwards_compatible_list}; do
-    if package_exists ${package}; then
-      filtered_backwards_compatible_list+=" ${package}"
-    fi
-  done
-fi
-# The `sort -r -s -t: -k2` sorts all the :i386 packages to the front, to avoid
-# confusing dpkg-query (crbug.com/446172).
-packages="$(
-  echo "${dev_list} ${lib_list} ${dbg_list} ${lib32_list} ${arm_list}" \
-       "${nacl_list}" ${filtered_backwards_compatible_list} | tr " " "\n" | \
-       sort -u | sort -r -s -t: -k2 | tr "\n" " "
-)"
-if [ 1 -eq "${do_quick_check-0}" ] ; then
-  if ! missing_packages="$(dpkg-query -W -f ' ' ${packages} 2>&1)"; then
-    # Distinguish between packages that actually aren't available to the
-    # system (i.e. not in any repo) and packages that just aren't known to
-    # dpkg (i.e. managed by apt).
-    missing_packages="$(echo "${missing_packages}" | awk '{print $NF}')"
-    not_installed=""
-    unknown=""
-    for p in ${missing_packages}; do
-      if apt-cache show ${p} > /dev/null 2>&1; then
-        not_installed="${p}\n${not_installed}"
-      else
-        unknown="${p}\n${unknown}"
-      fi
-    done
-    if [ -n "${not_installed}" ]; then
-      echo "WARNING: The following packages are not installed:"
-      echo -e "${not_installed}" | sed -e "s/^/  /"
-    fi
-    if [ -n "${unknown}" ]; then
-      echo "WARNING: The following packages are unknown to your system"
-      echo "(maybe missing a repo or need to 'sudo apt-get update'):"
-      echo -e "${unknown}" | sed -e "s/^/  /"
-    fi
-    exit 1
-  fi
-  exit 0
-fi
-if [ "$do_inst_lib32" = "1" ] || [ "$do_inst_nacl" = "1" ]; then
-  sudo dpkg --add-architecture i386
-fi
-sudo apt-get update
-# We initially run "apt-get" with the --reinstall option and parse its output.
-# This way, we can find all the packages that need to be newly installed
-# without accidentally promoting any packages from "auto" to "manual".
-# We then re-run "apt-get" with just the list of missing packages.
-echo "Finding missing packages..."
-# Intentionally leaving $packages unquoted so it's more readable.
-echo "Packages required: " $packages
-echo
-new_list_cmd="sudo apt-get install --reinstall $(echo $packages)"
-if new_list="$(yes n | LANGUAGE=en LANG=C $new_list_cmd)"; then
-  # We probably never hit this following line.
-  echo "No missing packages, and the packages are up to date."
-elif [ $? -eq 1 ]; then
-  # We expect apt-get to have exit status of 1.
-  # This indicates that we cancelled the install with "yes n|".
-  new_list=$(echo "$new_list" |
-    sed -e '1,/The following NEW packages will be installed:/d;s/^  //;t;d')
-  new_list=$(echo "$new_list" | sed 's/ *$//')
-  if [ -z "$new_list" ] ; then
-    echo "No missing packages, and the packages are up to date."
-  else
-    echo "Installing missing packages: $new_list."
-    sudo apt-get install ${do_quietly-} ${new_list}
-  fi
-  echo
-else
-  # An apt-get exit status of 100 indicates that a real error has occurred.
-  # I am intentionally leaving out the '"'s around new_list_cmd,
-  # as this makes it easier to cut and paste the output
-  echo "The following command failed: " ${new_list_cmd}
-  echo
-  echo "It produces the following output:"
-  yes n | $new_list_cmd || true
-  echo
-  echo "You will have to install the above packages yourself."
-  echo
-  exit 100
-fi
-# Install the Chrome OS default fonts. This must go after running
-# apt-get, since install-chromeos-fonts depends on curl.
-if [ "$do_inst_chromeos_fonts" != "0" ]; then
-  echo
-  echo "Installing Chrome OS fonts."
-  dir=`echo $0 | sed -r -e 's/\/[^/]+$//'`
-  if ! sudo $dir/linux/install-chromeos-fonts.py; then
-    echo "ERROR: The installation of the Chrome OS default fonts failed."
-    if [ `stat -f -c %T $dir` == "nfs" ]; then
-      echo "The reason is that your repo is installed on a remote file system."
-    else
-      echo "This is expected if your repo is installed on a remote file system."
-    fi
-    echo "It is recommended to install your repo on a local file system."
-    echo "You can skip the installation of the Chrome OS default founts with"
-    echo "the command line option: --no-chromeos-fonts."
-    exit 1
-  fi
-else
-  echo "Skipping installation of Chrome OS fonts."
-fi
-echo "Installing locales."
-CHROMIUM_LOCALES="da_DK.UTF-8 fr_FR.UTF-8 he_IL.UTF-8 zh_TW.UTF-8"
-LOCALE_GEN=/etc/locale.gen
-if [ -e ${LOCALE_GEN} ]; then
-  OLD_LOCALE_GEN="$(cat /etc/locale.gen)"
-  for CHROMIUM_LOCALE in ${CHROMIUM_LOCALES}; do
-    sudo sed -i "s/^# ${CHROMIUM_LOCALE}/${CHROMIUM_LOCALE}/" ${LOCALE_GEN}
-  done
-  # Regenerating locales can take a while, so only do it if we need to.
-  if (echo "${OLD_LOCALE_GEN}" | cmp -s ${LOCALE_GEN}); then
-    echo "Locales already up-to-date."
-  else
-    sudo locale-gen
-  fi
-else
-  for CHROMIUM_LOCALE in ${CHROMIUM_LOCALES}; do
-    sudo locale-gen ${CHROMIUM_LOCALE}
-  done
-fi
--- a/build/mac/make_locale_dirs.py
+++ b/build/mac/make_locale_dirs.py
@@ -8,6 +8,7 @@
 # require any direct Cocoa locale support.

 import os
+import errno
 import sys


@@ -16,7 +17,7 @@ def main(args):
    try:
      os.makedirs(dirname)
    except OSError as e:
-      if e.errno == os.errno.EEXIST:
+      if e.errno == errno.EEXIST:
        # It's OK if it already exists
        pass
      else:
--- a/build/npm-run.py
+++ b/build/npm-run.py
@@ -15,12 +15,6 @@ args = [cmd, "run",
 try:
    subprocess.check_output(args, stderr=subprocess.STDOUT)
 except subprocess.CalledProcessError as e:
-    print(
-        "NPM script '"
-        + sys.argv[2]
-        + "' failed with code '"
-        + str(e.returncode)
-        + "':\n"
-        + e.output
-    )
+    error_msg = "NPM script '{}' failed with code '{}':\n".format(sys.argv[2], e.returncode)
+    print(error_msg + e.output.decode('utf8'))
    sys.exit(e.returncode)
--- a/build/webpack/webpack.config.base.js
+++ b/build/webpack/webpack.config.base.js
@@ -163,7 +163,7 @@ if ((globalThis.process || binding.process).argv.includes("--profile-electron-in
        setImmediate: false
      },
      optimization: {
-        minimize: true,
+        minimize: env.mode === 'production',
        minimizer: [
          new TerserPlugin({
            terserOptions: {
--- a/build/webpack/webpack.gni
+++ b/build/webpack/webpack.gni
@@ -22,6 +22,11 @@ template("webpack_build") {
               "//electron/typings/internal-electron.d.ts",
             ] + invoker.inputs

+    mode = "development"
+    if (is_official_build) {
+      mode = "production"
+    }
+
    args = [
      "--config",
      rebase_path(invoker.config_file),
@@ -29,6 +34,7 @@ template("webpack_build") {
      "--output-path=" + rebase_path(get_path_info(invoker.out_file, "dir")),
      "--env.buildflags=" +
          rebase_path("$target_gen_dir/buildflags/buildflags.h"),
+      "--env.mode=" + mode,
    ]
    deps += [ "buildflags" ]

--- a/build/zip.py
+++ b/build/zip.py
@@ -39,6 +39,7 @@ PATHS_TO_SKIP = [
  './crashpad_handler',
  # Skip because these are outputs that we don't need.
  'resources/inspector',
+  'gen/third_party/devtools-frontend/src'
 ]

 def skip_path(dep, dist_zip, target_cpu):
@@ -70,7 +71,7 @@ def execute(argv):
    raise e

 def main(argv):
-  dist_zip, runtime_deps, target_cpu, _, flatten_val = argv
+  dist_zip, runtime_deps, target_cpu, _, flatten_val, flatten_relative_to = argv
  should_flatten = flatten_val == "true"
  dist_files = set()
  with open(runtime_deps) as f:
@@ -97,11 +98,18 @@ def main(argv):
            if basename == 'chrome_sandbox'
            else dep
          )
+          name_to_write = arcname
+          if should_flatten:
+            if flatten_relative_to:
+              if name_to_write.startswith(flatten_relative_to):
+                name_to_write = name_to_write[len(flatten_relative_to):]
+              else:
+                name_to_write = os.path.basename(arcname)
+            else:
+              name_to_write = os.path.basename(arcname)
          z.write(
            dep,
-            os.path.basename(arcname)
-            if should_flatten
-            else arcname,
+            name_to_write,
          )

 if __name__ == '__main__':
--- a/build/zip_libcxx.py
+++ b/build/zip_libcxx.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+from __future__ import print_function
+import os
+import subprocess
+import sys
+import zipfile
+
+def execute(argv):
+  try:
+    output = subprocess.check_output(argv, stderr=subprocess.STDOUT)
+    return output
+  except subprocess.CalledProcessError as e:
+    print(e.output)
+    raise e
+
+def get_object_files(base_path, archive_name):
+  archive_file = os.path.join(base_path, archive_name)
+  output = execute(['nm', '-g', archive_file]).decode('ascii')
+  object_files = set()
+  lines = output.split("\n")
+  for line in lines:
+    if line.startswith(base_path):
+      object_file = line.split(":")[0]
+      object_files.add(object_file)
+    if line.startswith('nm: '):
+      object_file = line.split(":")[1].lstrip()
+      object_files.add(object_file)
+  return list(object_files) + [archive_file]
+
+def main(argv):
+  dist_zip, = argv
+  out_dir = os.path.dirname(dist_zip)
+  base_path_libcxx = os.path.join(out_dir, 'obj/buildtools/third_party/libc++')
+  base_path_libcxxabi = os.path.join(out_dir, 'obj/buildtools/third_party/libc++abi')
+  object_files_libcxx = get_object_files(base_path_libcxx, 'libc++.a')
+  object_files_libcxxabi = get_object_files(base_path_libcxxabi, 'libc++abi.a')
+  with zipfile.ZipFile(
+      dist_zip, 'w', zipfile.ZIP_DEFLATED, allowZip64=True
+    ) as z:
+      object_files_libcxx.sort()
+      for object_file in object_files_libcxx:
+        z.write(object_file, os.path.relpath(object_file, base_path_libcxx))
+      for object_file in object_files_libcxxabi:
+        z.write(object_file, os.path.relpath(object_file, base_path_libcxxabi))
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))
--- a/chromium_src/BUILD.gn
+++ b/chromium_src/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by the MIT license that can be
 # found in the LICENSE file.

+import("//build/config/ozone.gni")
 import("//build/config/ui.gni")
 import("//components/spellcheck/spellcheck_build_features.gni")
 import("//electron/buildflags/buildflags.gni")
@@ -16,8 +17,6 @@ static_library("chrome") {
    "//chrome/browser/accessibility/accessibility_ui.h",
    "//chrome/browser/browser_process.cc",
    "//chrome/browser/browser_process.h",
-    "//chrome/browser/crash_upload_list/crash_upload_list_crashpad.cc",
-    "//chrome/browser/crash_upload_list/crash_upload_list_crashpad.h",
    "//chrome/browser/devtools/devtools_contents_resizing_strategy.cc",
    "//chrome/browser/devtools/devtools_contents_resizing_strategy.h",
    "//chrome/browser/devtools/devtools_embedder_message_dispatcher.cc",
@@ -46,7 +45,6 @@ static_library("chrome") {
    "//chrome/browser/predictors/resolve_host_client_impl.h",
    "//chrome/browser/ssl/security_state_tab_helper.cc",
    "//chrome/browser/ssl/security_state_tab_helper.h",
-    "//chrome/browser/ssl/tls_deprecation_config.cc",
    "//chrome/browser/ui/views/autofill/autofill_popup_view_utils.cc",
    "//chrome/browser/ui/views/autofill/autofill_popup_view_utils.h",
    "//extensions/browser/app_window/size_constraints.cc",
@@ -76,6 +74,7 @@ static_library("chrome") {
  }

  public_deps = [
+    "//chrome/browser:dev_ui_browser_resources",
    "//chrome/common",
    "//chrome/common:version_header",
    "//components/keyed_service/content",
@@ -83,6 +82,7 @@ static_library("chrome") {
    "//components/proxy_config",
    "//components/security_state/content",
    "//content/public/browser",
+    "//services/strings",
  ]

  deps = [
@@ -93,12 +93,18 @@ static_library("chrome") {

  if (is_linux) {
    sources += [ "//chrome/browser/icon_loader_auralinux.cc" ]
+    if (use_x11 || use_ozone) {
+      sources +=
+          [ "//chrome/browser/extensions/global_shortcut_listener_linux.cc" ]
+    }
    if (use_x11) {
      sources += [
        "//chrome/browser/extensions/global_shortcut_listener_x11.cc",
        "//chrome/browser/extensions/global_shortcut_listener_x11.h",
      ]
-    } else if (use_ozone) {
+    }
+    if (use_ozone) {
+      deps += [ "//ui/ozone" ]
      sources += [
        "//chrome/browser/extensions/global_shortcut_listener_ozone.cc",
        "//chrome/browser/extensions/global_shortcut_listener_ozone.h",
@@ -139,14 +145,23 @@ static_library("chrome") {

  if (enable_color_chooser) {
    sources += [
+      "//chrome/browser/devtools/devtools_eye_dropper.cc",
+      "//chrome/browser/devtools/devtools_eye_dropper.h",
      "//chrome/browser/platform_util.cc",
      "//chrome/browser/platform_util.h",
      "//chrome/browser/ui/browser_dialogs.h",
      "//chrome/browser/ui/color_chooser.h",
+      "//chrome/browser/ui/views/eye_dropper/eye_dropper.cc",
+      "//chrome/browser/ui/views/eye_dropper/eye_dropper.h",
+      "//chrome/browser/ui/views/eye_dropper/eye_dropper_view.cc",
+      "//chrome/browser/ui/views/eye_dropper/eye_dropper_view.h",
    ]

    if (use_aura) {
-      sources += [ "//chrome/browser/platform_util_aura.cc" ]
+      sources += [
+        "//chrome/browser/platform_util_aura.cc",
+        "//chrome/browser/ui/views/eye_dropper/eye_dropper_view_aura.cc",
+      ]

      if (!is_win) {
        sources += [
@@ -163,6 +178,8 @@ static_library("chrome") {
        "//chrome/browser/media/webrtc/window_icon_util_mac.mm",
        "//chrome/browser/ui/cocoa/color_chooser_mac.h",
        "//chrome/browser/ui/cocoa/color_chooser_mac.mm",
+        "//chrome/browser/ui/views/eye_dropper/eye_dropper_view_mac.h",
+        "//chrome/browser/ui/views/eye_dropper/eye_dropper_view_mac.mm",
      ]
      deps += [
        "//components/remote_cocoa/app_shim",
@@ -180,7 +197,7 @@ static_library("chrome") {
    }

    if (is_linux) {
-      sources += [ "//chrome/browser/media/webrtc/window_icon_util_x11.cc" ]
+      sources += [ "//chrome/browser/media/webrtc/window_icon_util_linux.cc" ]
    }
  }

@@ -208,8 +225,6 @@ static_library("chrome") {
      "//chrome/browser/printing/print_view_manager_basic.h",
      "//chrome/browser/printing/printer_query.cc",
      "//chrome/browser/printing/printer_query.h",
-      "//chrome/browser/printing/printing_message_filter.cc",
-      "//chrome/browser/printing/printing_message_filter.h",
      "//chrome/browser/printing/printing_service.cc",
      "//chrome/browser/printing/printing_service.h",
    ]
@@ -244,8 +259,12 @@ static_library("chrome") {
      "//chrome/browser/picture_in_picture/picture_in_picture_window_manager.h",
      "//chrome/browser/ui/views/overlay/back_to_tab_image_button.cc",
      "//chrome/browser/ui/views/overlay/back_to_tab_image_button.h",
+      "//chrome/browser/ui/views/overlay/back_to_tab_label_button.cc",
      "//chrome/browser/ui/views/overlay/close_image_button.cc",
      "//chrome/browser/ui/views/overlay/close_image_button.h",
+      "//chrome/browser/ui/views/overlay/constants.h",
+      "//chrome/browser/ui/views/overlay/hang_up_button.cc",
+      "//chrome/browser/ui/views/overlay/hang_up_button.h",
      "//chrome/browser/ui/views/overlay/overlay_window_views.cc",
      "//chrome/browser/ui/views/overlay/overlay_window_views.h",
      "//chrome/browser/ui/views/overlay/playback_image_button.cc",
@@ -254,6 +273,10 @@ static_library("chrome") {
      "//chrome/browser/ui/views/overlay/resize_handle_button.h",
      "//chrome/browser/ui/views/overlay/skip_ad_label_button.cc",
      "//chrome/browser/ui/views/overlay/skip_ad_label_button.h",
+      "//chrome/browser/ui/views/overlay/toggle_camera_button.cc",
+      "//chrome/browser/ui/views/overlay/toggle_camera_button.h",
+      "//chrome/browser/ui/views/overlay/toggle_microphone_button.cc",
+      "//chrome/browser/ui/views/overlay/toggle_microphone_button.h",
      "//chrome/browser/ui/views/overlay/track_image_button.cc",
      "//chrome/browser/ui/views/overlay/track_image_button.h",
    ]
--- a/chromium_src/chrome/browser/certificate_manager_model.cc
+++ b/chromium_src/chrome/browser/certificate_manager_model.cc
@@ -90,7 +90,7 @@ CertificateManagerModel::~CertificateManagerModel() = default;
 int CertificateManagerModel::ImportFromPKCS12(
    PK11SlotInfo* slot_info,
    const std::string& data,
-    const base::string16& password,
+    const std::u16string& password,
    bool is_extractable,
    net::ScopedCERTCertificateList* imported_certs) {
  return cert_db_->ImportFromPKCS12(slot_info, data, password, is_extractable,
--- a/chromium_src/chrome/browser/certificate_manager_model.h
+++ b/chromium_src/chrome/browser/certificate_manager_model.h
@@ -12,7 +12,6 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/strings/string16.h"
 #include "net/cert/nss_cert_database.h"

 namespace content {
@@ -46,7 +45,7 @@ class CertificateManagerModel {
  // Returns a net error code on failure.
  int ImportFromPKCS12(PK11SlotInfo* slot_info,
                       const std::string& data,
-                       const base::string16& password,
+                       const std::u16string& password,
                       bool is_extractable,
                       net::ScopedCERTCertificateList* imported_certs);

--- a/chromium_src/chrome/browser/process_singleton.h
+++ b/chromium_src/chrome/browser/process_singleton.h
@@ -127,10 +127,11 @@ class ProcessSingleton {
  NotificationCallback notification_callback_;  // Handler for notifications.

 #if defined(OS_WIN)
-  HWND remote_window_;               // The HWND_MESSAGE of another browser.
+  HWND remote_window_ = nullptr;     // The HWND_MESSAGE of another browser.
  base::win::MessageWindow window_;  // The message-only window.
-  bool is_virtualized_;  // Stuck inside Microsoft Softricity VM environment.
-  HANDLE lock_file_;
+  bool is_virtualized_ =
+      false;  // Stuck inside Microsoft Softricity VM environment.
+  HANDLE lock_file_ = INVALID_HANDLE_VALUE;
  base::FilePath user_data_dir_;
  ShouldKillRemoteProcessCallback should_kill_remote_process_callback_;
 #elif defined(OS_POSIX) && !defined(OS_ANDROID)
@@ -175,7 +176,7 @@ class ProcessSingleton {
  // because it posts messages between threads.
  class LinuxWatcher;
  scoped_refptr<LinuxWatcher> watcher_;
-  int sock_;
+  int sock_ = -1;
  bool listen_on_ready_ = false;
 #endif

--- a/chromium_src/chrome/browser/process_singleton_posix.cc
+++ b/chromium_src/chrome/browser/process_singleton_posix.cc
@@ -333,7 +333,7 @@ bool IsChromeProcess(pid_t pid) {
 // A helper class to hold onto a socket.
 class ScopedSocket {
 public:
-  ScopedSocket() : fd_(-1) { Reset(); }
+  ScopedSocket() { Reset(); }
  ~ScopedSocket() { Close(); }
  int fd() { return fd_; }
  void Reset() {
@@ -347,7 +347,7 @@ class ScopedSocket {
  }

 private:
-  int fd_;
+  int fd_ = -1;
 };

 // Returns a random string for uniquifying profile connections.
@@ -473,10 +473,7 @@ class ProcessSingleton::LinuxWatcher
    SocketReader(ProcessSingleton::LinuxWatcher* parent,
                 scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
                 int fd)
-        : parent_(parent),
-          ui_task_runner_(ui_task_runner),
-          fd_(fd),
-          bytes_read_(0) {
+        : parent_(parent), ui_task_runner_(ui_task_runner), fd_(fd) {
      DCHECK_CURRENTLY_ON(BrowserThread::IO);
      // Wait for reads.
      fd_watch_controller_ = base::FileDescriptorWatcher::WatchReadable(
@@ -508,20 +505,20 @@ class ProcessSingleton::LinuxWatcher
        fd_watch_controller_;

    // The ProcessSingleton::LinuxWatcher that owns us.
-    ProcessSingleton::LinuxWatcher* const parent_;
+    ProcessSingleton::LinuxWatcher* const parent_ = nullptr;

    // A reference to the UI task runner.
    scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;

    // The file descriptor we're reading.
-    const int fd_;
+    const int fd_ = -1;

    // Store the message in this buffer.
    char buf_[kMaxMessageLength];

    // Tracks the number of bytes we've read in case we're getting partial
    // reads.
-    size_t bytes_read_;
+    size_t bytes_read_ = 0;

    base::OneShotTimer timer_;

--- a/chromium_src/chrome/browser/process_singleton_win.cc
+++ b/chromium_src/chrome/browser/process_singleton_win.cc
@@ -172,8 +172,6 @@ ProcessSingleton::ProcessSingleton(
    const base::FilePath& user_data_dir,
    const NotificationCallback& notification_callback)
    : notification_callback_(notification_callback),
-      is_virtualized_(false),
-      lock_file_(INVALID_HANDLE_VALUE),
      user_data_dir_(user_data_dir),
      should_kill_remote_process_callback_(
          base::BindRepeating(&TerminateAppWithError)) {
--- a/chromium_src/chrome/browser/ui/views/frame/global_menu_bar_registrar_x11.cc
+++ b/chromium_src/chrome/browser/ui/views/frame/global_menu_bar_registrar_x11.cc
@@ -38,8 +38,7 @@ void GlobalMenuBarRegistrarX11::OnWindowUnmapped(x11::Window window) {
  live_windows_.erase(window);
 }

-GlobalMenuBarRegistrarX11::GlobalMenuBarRegistrarX11()
-    : registrar_proxy_(nullptr) {
+GlobalMenuBarRegistrarX11::GlobalMenuBarRegistrarX11() {
  // libdbusmenu uses the gio version of dbus; I tried using the code in dbus/,
  // but it looks like that's isn't sharing the bus name with the gio version,
  // even when |connection_type| is set to SHARED.
--- a/chromium_src/chrome/browser/ui/views/frame/global_menu_bar_registrar_x11.h
+++ b/chromium_src/chrome/browser/ui/views/frame/global_menu_bar_registrar_x11.h
@@ -48,7 +48,7 @@ class GlobalMenuBarRegistrarX11 {
                     GObject*,
                     GParamSpec*);

-  GDBusProxy* registrar_proxy_;
+  GDBusProxy* registrar_proxy_ = nullptr;

  // x11::Window which want to be registered, but haven't yet been because
  // we're waiting for the proxy to become available.
--- a/default_app/default_app.ts
+++ b/default_app/default_app.ts
@@ -41,14 +41,14 @@ ipcMain.handle('bootstrap', (event) => {
  return isTrustedSender(event.sender) ? electronPath : null;
 });

-async function createWindow () {
+async function createWindow (backgroundColor?: string) {
  await app.whenReady();

  const options: Electron.BrowserWindowConstructorOptions = {
    width: 960,
    height: 620,
    autoHideMenuBar: true,
-    backgroundColor: '#2f3241',
+    backgroundColor,
    webPreferences: {
      preload: path.resolve(__dirname, 'preload.js'),
      contextIsolation: true,
@@ -96,7 +96,7 @@ export const loadURL = async (appUrl: string) => {
 };

 export const loadFile = async (appPath: string) => {
-  mainWindow = await createWindow();
+  mainWindow = await createWindow(appPath === 'index.html' ? '#2f3241' : undefined);
  mainWindow.loadFile(appPath);
  mainWindow.focus();
 };
--- a/default_app/index.html
+++ b/default_app/index.html
@@ -2,6 +2,7 @@

 <head>
  <title>Electron</title>
+  <meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script'; trusted-types electron-default-app" />
  <meta http-equiv="Content-Security-Policy" content="default-src 'none'; script-src 'sha256-6PH54BfkNq/EMMhUY7nhHf3c+AxloOwfy7hWyT01CM8='; style-src 'self'; img-src 'self'; connect-src 'self'" />
  <link href="./styles.css" type="text/css" rel="stylesheet" />
  <link href="./octicon/build.css" type="text/css" rel="stylesheet" />
--- a/default_app/preload.ts
+++ b/default_app/preload.ts
@@ -1,10 +1,15 @@
 import { ipcRenderer, contextBridge } from 'electron';

+const policy = window.trustedTypes.createPolicy('electron-default-app', {
+  // we trust the SVG contents
+  createHTML: input => input
+});
+
 async function getOcticonSvg (name: string) {
  try {
    const response = await fetch(`octicon/${name}.svg`);
    const div = document.createElement('div');
-    div.innerHTML = await response.text();
+    div.innerHTML = policy.createHTML(await response.text());
    return div;
  } catch {
    return null;
--- a/docs/README.md
+++ b/docs/README.md
@@ -18,20 +18,14 @@ an issue:

 ## Guides and Tutorials

-### Quickstart
+### Getting started

-* [Quick Start Guide](tutorial/quick-start.md)
-  * [Prerequisites](tutorial/quick-start.md#prerequisites)
-  * [Create a basic application](tutorial/quick-start.md#create-a-basic-application)
-  * [Run your application](tutorial/quick-start.md#run-your-application)
-  * [Package and distribute the application](tutorial/quick-start.md#package-and-distribute-the-application)
+* [Introduction](tutorial/introduction.md)
+* [Quick Start](tutorial/quick-start.md)
+* [Process Model](tutorial/process-model.md)

 ### Learning the basics

-* [Electron's Process Model](tutorial/quick-start.md#application-architecture)
-  * [Main and Renderer Processes](tutorial/quick-start.md#main-and-renderer-processes)
-  * [Electron API](tutorial/quick-start.md#electron-api)
-  * [Node.js API](tutorial/quick-start.md#nodejs-api)
 * Adding Features to Your App
  * [Notifications](tutorial/notifications.md)
  * [Recent Documents](tutorial/recent-documents.md)
@@ -59,6 +53,7 @@ an issue:
  * [Using Native Node.js Modules](tutorial/using-native-node-modules.md)
  * [Performance Strategies](tutorial/performance.md)
  * [Security Strategies](tutorial/security.md)
+  * [Process Sandboxing](tutorial/sandbox.md)
 * [Accessibility](tutorial/accessibility.md)
  * [Manually Enabling Accessibility Features](tutorial/accessibility.md#manually-enabling-accessibility-features)
 * [Testing and Debugging](tutorial/application-debugging.md)
@@ -68,6 +63,7 @@ an issue:
  * [Testing on Headless CI Systems (Travis, Jenkins)](tutorial/testing-on-headless-ci.md)
  * [DevTools Extension](tutorial/devtools-extension.md)
  * [Automated Testing with a Custom Driver](tutorial/automated-testing-with-a-custom-driver.md)
+  * [REPL](tutorial/repl.md)
 * [Distribution](tutorial/application-distribution.md)
  * [Supported Platforms](tutorial/support.md#supported-platforms)
  * [Code Signing](tutorial/code-signing.md)
@@ -91,11 +87,6 @@ These individual tutorials expand on topics discussed in the guide above.
 * Electron Releases & Developer Feedback
  * [Versioning Policy](tutorial/electron-versioning.md)
  * [Release Timelines](tutorial/electron-timelines.md)
-* [Packaging App Source Code with asar](tutorial/application-packaging.md)
-  * [Generating asar Archives](tutorial/application-packaging.md#generating-asar-archives)
-  * [Using asar Archives](tutorial/application-packaging.md#using-asar-archives)
-  * [Limitations](tutorial/application-packaging.md#limitations-of-the-node-api)
-  * [Adding Unpacked Files to asar Archives](tutorial/application-packaging.md#adding-unpacked-files-to-asar-archives)
 * [Testing Widevine CDM](tutorial/testing-widevine-cdm.md)

 ---
@@ -131,6 +122,8 @@ These individual tutorials expand on topics discussed in the guide above.
 * [ipcMain](api/ipc-main.md)
 * [Menu](api/menu.md)
 * [MenuItem](api/menu-item.md)
+* [MessageChannelMain](api/message-channel-main.md)
+* [MessagePortMain](api/message-port-main.md)
 * [net](api/net.md)
 * [netLog](api/net-log.md)
 * [nativeTheme](api/native-theme.md)
@@ -140,6 +133,7 @@ These individual tutorials expand on topics discussed in the guide above.
 * [protocol](api/protocol.md)
 * [screen](api/screen.md)
 * [session](api/session.md)
+* [ShareMenu](api/share-menu.md)
 * [systemPreferences](api/system-preferences.md)
 * [TouchBar](api/touch-bar.md)
 * [Tray](api/tray.md)
@@ -148,15 +142,15 @@ These individual tutorials expand on topics discussed in the guide above.

 ### Modules for the Renderer Process (Web Page):

-* [desktopCapturer](api/desktop-capturer.md)
+* [contextBridge](api/context-bridge.md)
 * [ipcRenderer](api/ipc-renderer.md)
-* [remote](api/remote.md)
 * [webFrame](api/web-frame.md)

 ### Modules for Both Processes:

 * [clipboard](api/clipboard.md)
 * [crashReporter](api/crash-reporter.md)
+* [desktopCapturer](api/desktop-capturer.md)
 * [nativeImage](api/native-image.md)
 * [shell](api/shell.md)

--- a/docs/api/accelerator.md
+++ b/docs/api/accelerator.md
@@ -35,7 +35,7 @@ Linux and Windows to define some accelerators.
 Use `Alt` instead of `Option`. The `Option` key only exists on macOS, whereas
 the `Alt` key is available on all platforms.

-The `Super` key is mapped to the `Windows` key on Windows and Linux and
+The `Super` (or `Meta`) key is mapped to the `Windows` key on Windows and Linux and
 `Cmd` on macOS.

 ## Available modifiers
@@ -48,6 +48,7 @@ The `Super` key is mapped to the `Windows` key on Windows and Linux and
 * `AltGr`
 * `Shift`
 * `Super`
+* `Meta`

 ## Available key codes

--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -391,7 +391,7 @@ which contains more information about why the render process disappeared. It
 isn't always because it crashed.  The `killed` boolean can be replaced by
 checking `reason === 'killed'` when you switch to that event.

-#### Event: 'render-process-gone'
+### Event: 'render-process-gone'

 Returns:

@@ -406,11 +406,14 @@ Returns:
    * `oom` - Process ran out of memory
    * `launch-failed` - Process never successfully launched
    * `integrity-failure` - Windows code integrity checks failed
+  * `exitCode` Integer - The exit code of the process, unless `reason` is
+    `launch-failed`, in which case `exitCode` will be a platform-specific
+    launch failure error code.

 Emitted when the renderer process unexpectedly disappears.  This is normally
 because it was crashed or killed.

-#### Event: 'child-process-gone'
+### Event: 'child-process-gone'

 Returns:

@@ -750,7 +753,8 @@ Overrides the current application's name.

 ### `app.getLocale()`

-Returns `String` - The current application locale. Possible return values are documented [here](locales.md).
+Returns `String` - The current application locale, fetched using Chromium's `l10n_util` library.
+Possible return values are documented [here](https://source.chromium.org/chromium/chromium/src/+/master:ui/base/l10n/l10n_util.cc).

 To set the locale, you'll want to use a command line switch at app startup, which may be found [here](https://github.com/electron/electron/blob/master/docs/api/command-line-switches.md).

@@ -926,6 +930,10 @@ re-add a removed item to a custom category earlier than that will result in the
 entire custom category being omitted from the Jump List. The list of removed
 items can be obtained using `app.getJumpListSettings()`.

+**Note:** The maximum length of a Jump List item's `description` property is
+260 characters. Beyond this limit, the item will not be added to the Jump
+List, nor will it be displayed.
+
 Here's a very simple example of creating a custom Jump List:

 ```javascript
@@ -1174,9 +1182,9 @@ For `infoType` equal to `basic`:

 Using `basic` should be preferred if only basic information like `vendorId` or `driverId` is needed.

-### `app.setBadgeCount(count)` _Linux_ _macOS_
+### `app.setBadgeCount([count])` _Linux_ _macOS_

-* `count` Integer
+* `count` Integer (optional) - If a value is provided, set the badge to the provided value otherwise, on macOS, display a plain white dot (e.g. unknown number of notifications). On Linux, if a value is not provided the badge will not display.

 Returns `Boolean` - Whether the call succeeded.

--- a/docs/api/browser-view.md
+++ b/docs/api/browser-view.md
@@ -1,14 +1,16 @@
-## Class: BrowserView
-
-> Create and control views.
-
-Process: [Main](../glossary.md#main-process)
+# BrowserView

 A `BrowserView` can be used to embed additional web content into a
 [`BrowserWindow`](browser-window.md). It is like a child window, except that it is positioned
 relative to its owning window. It is meant to be an alternative to the
 `webview` tag.

+## Class: BrowserView
+
+> Create and control views.
+
+Process: [Main](../glossary.md#main-process)
+
 ### Example

 ```javascript
--- a/docs/api/browser-window.md
+++ b/docs/api/browser-window.md
@@ -187,9 +187,9 @@ It creates a new `BrowserWindow` with native properties as set by the `options`.
  * `parent` BrowserWindow (optional) - Specify parent window. Default is `null`.
  * `modal` Boolean (optional) - Whether this is a modal window. This only works when the
    window is a child window. Default is `false`.
-  * `acceptFirstMouse` Boolean (optional) - Whether the web view accepts a single
-    mouse-down event that simultaneously activates the window. Default is
-    `false`.
+  * `acceptFirstMouse` Boolean (optional) - Whether clicking an inactive window will also
+  click through to the web contents. Default is `false` on macOS. This option is not
+  configurable on other platforms.
  * `disableAutoHideCursor` Boolean (optional) - Whether to hide cursor when typing.
    Default is `false`.
  * `autoHideMenuBar` Boolean (optional) - Auto hide the menu bar unless the `Alt`
@@ -222,21 +222,23 @@ It creates a new `BrowserWindow` with native properties as set by the `options`.
      the top left.
    * `hiddenInset` - Results in a hidden title bar with an alternative look
      where the traffic light buttons are slightly more inset from the window edge.
-    * `customButtonsOnHover` Boolean (optional) - Draw custom close,
-      and minimize buttons on macOS frameless windows. These buttons will not display
-      unless hovered over in the top left of the window. These custom buttons prevent
-      issues with mouse events that occur with the standard window toolbar buttons.
-      **Note:** This option is currently experimental.
-  * `trafficLightPosition` [Point](structures/point.md) (optional) - Set a custom position for the traffic light buttons. Can only be used with `titleBarStyle` set to `hidden`
-  * `fullscreenWindowTitle` Boolean (optional) - Shows the title in the
-    title bar in full screen mode on macOS for all `titleBarStyle` options.
+    * `customButtonsOnHover` - Results in a hidden title bar and a full size
+      content window, the traffic light buttons will display when being hovered
+      over in the top left of the window.  **Note:** This option is currently
+      experimental.
+  * `trafficLightPosition` [Point](structures/point.md) (optional) - Set a
+    custom position for the traffic light buttons in frameless windows.
+  * `roundedCorners` Boolean (optional) - Whether frameless window should have
+    rounded corners on macOS. Default is `true`.
+  * `fullscreenWindowTitle` Boolean (optional) _Deprecated_ - Shows the title in
+    the title bar in full screen mode on macOS for `hiddenInset` titleBarStyle.
    Default is `false`.
  * `thickFrame` Boolean (optional) - Use `WS_THICKFRAME` style for frameless windows on
    Windows, which adds standard window frame. Setting it to `false` will remove
    window shadow and window animations. Default is `true`.
  * `vibrancy` String (optional) - Add a type of vibrancy effect to the window, only on
    macOS. Can be `appearance-based`, `light`, `dark`, `titlebar`, `selection`,
-    `menu`, `popover`, `sidebar`, `medium-light`, `ultra-dark`, `header`, `sheet`, `window`, `hud`, `fullscreen-ui`, `tooltip`, `content`, `under-window`, or `under-page`.  Please note that using `frame: false` in combination with a vibrancy value requires that you use a non-default `titleBarStyle` as well. Also note that `appearance-based`, `light`, `dark`, `medium-light`, and `ultra-dark` have been deprecated and will be removed in an upcoming version of macOS.
+    `menu`, `popover`, `sidebar`, `medium-light`, `ultra-dark`, `header`, `sheet`, `window`, `hud`, `fullscreen-ui`, `tooltip`, `content`, `under-window`, or `under-page`. Please note that `appearance-based`, `light`, `dark`, `medium-light`, and `ultra-dark` are deprecated and have been removed in macOS Catalina (10.15).
  * `zoomToPageWidth` Boolean (optional) - Controls the behavior on macOS when
    option-clicking the green stoplight button on the toolbar or by clicking the
    Window > Zoom menu item. If `true`, the window will grow to the preferred
@@ -265,12 +267,12 @@ It creates a new `BrowserWindow` with native properties as set by the `options`.
      be the absolute file path to the script.
      When node integration is turned off, the preload script can reintroduce
      Node global symbols back to the global scope. See example
-      [here](process.md#event-loaded).
+      [here](context-bridge.md#exposing-node-global-symbols).
    * `sandbox` Boolean (optional) - If set, this will sandbox the renderer
      associated with the window, making it compatible with the Chromium
      OS-level sandbox and disabling the Node.js engine. This is not the same as
      the `nodeIntegration` option and the APIs available to the preload script
-      are more limited. Read more about the option [here](sandbox-option.md).
+      are more limited. Read more about the option [here](../tutorial/sandbox.md).
    * `enableRemoteModule` Boolean (optional) - Whether to enable the [`remote`](remote.md) module.
      Default is `false`.
    * `session` [Session](session.md#class-session) (optional) - Sets the session used by the
@@ -337,7 +339,7 @@ It creates a new `BrowserWindow` with native properties as set by the `options`.
      more details.
    * `contextIsolation` Boolean (optional) - Whether to run Electron APIs and
      the specified `preload` script in a separate JavaScript context. Defaults
-      to `false`. The context that the `preload` script runs in will only have
+      to `true`. The context that the `preload` script runs in will only have
      access to its own dedicated `document` and `window` globals, as well as
      its own set of JavaScript builtins (`Array`, `Object`, `JSON`, etc.),
      which are all invisible to the loaded content. The Electron API will only
@@ -349,8 +351,7 @@ It creates a new `BrowserWindow` with native properties as set by the `options`.
      context in the dev tools by selecting the 'Electron Isolated Context'
      entry in the combo box at the top of the Console tab.
    * `worldSafeExecuteJavaScript` Boolean (optional) - If true, values returned from `webFrame.executeJavaScript` will be sanitized to ensure JS values
-      can't unsafely cross between worlds when using `contextIsolation`.  The default
-      is `false`. In Electron 12, the default will be changed to `true`. _Deprecated_
+      can't unsafely cross between worlds when using `contextIsolation`. Defaults to `true`. _Deprecated_
    * `nativeWindowOpen` Boolean (optional) - Whether to use native
      `window.open()`. Defaults to `false`. Child windows will always have node
      integration disabled unless `nodeIntegrationInSubFrames` is true. **Note:** This option is currently
@@ -723,94 +724,6 @@ Returns `BrowserWindow | null` - The window that owns the given `browserView`. I

 Returns `BrowserWindow | null` - The window with the given `id`.

-#### `BrowserWindow.addExtension(path)` _Deprecated_
-
-* `path` String
-
-Adds Chrome extension located at `path`, and returns extension's name.
-
-The method will also not return if the extension's manifest is missing or incomplete.
-
-**Note:** This API cannot be called before the `ready` event of the `app` module
-is emitted.
-
-**Note:** This method is deprecated. Instead, use
-[`ses.loadExtension(path)`](session.md#sesloadextensionpath).
-
-#### `BrowserWindow.removeExtension(name)` _Deprecated_
-
-* `name` String
-
-Remove a Chrome extension by name.
-
-**Note:** This API cannot be called before the `ready` event of the `app` module
-is emitted.
-
-**Note:** This method is deprecated. Instead, use
-[`ses.removeExtension(extension_id)`](session.md#sesremoveextensionextensionid).
-
-#### `BrowserWindow.getExtensions()` _Deprecated_
-
-Returns `Record<String, ExtensionInfo>` - The keys are the extension names and each value is
-an Object containing `name` and `version` properties.
-
-**Note:** This API cannot be called before the `ready` event of the `app` module
-is emitted.
-
-**Note:** This method is deprecated. Instead, use
-[`ses.getAllExtensions()`](session.md#sesgetallextensions).
-
-#### `BrowserWindow.addDevToolsExtension(path)` _Deprecated_
-
-* `path` String
-
-Adds DevTools extension located at `path`, and returns extension's name.
-
-The extension will be remembered so you only need to call this API once, this
-API is not for programming use. If you try to add an extension that has already
-been loaded, this method will not return and instead log a warning to the
-console.
-
-The method will also not return if the extension's manifest is missing or incomplete.
-
-**Note:** This API cannot be called before the `ready` event of the `app` module
-is emitted.
-
-**Note:** This method is deprecated. Instead, use
-[`ses.loadExtension(path)`](session.md#sesloadextensionpath).
-
-#### `BrowserWindow.removeDevToolsExtension(name)` _Deprecated_
-
-* `name` String
-
-Remove a DevTools extension by name.
-
-**Note:** This API cannot be called before the `ready` event of the `app` module
-is emitted.
-
-**Note:** This method is deprecated. Instead, use
-[`ses.removeExtension(extension_id)`](session.md#sesremoveextensionextensionid).
-
-#### `BrowserWindow.getDevToolsExtensions()` _Deprecated_
-
-Returns `Record<string, ExtensionInfo>` - The keys are the extension names and each value is
-an Object containing `name` and `version` properties.
-
-To check if a DevTools extension is installed you can run the following:
-
-```javascript
-const { BrowserWindow } = require('electron')
-
-const installed = 'devtron' in BrowserWindow.getDevToolsExtensions()
-console.log(installed)
-```
-
-**Note:** This API cannot be called before the `ready` event of the `app` module
-is emitted.
-
-**Note:** This method is deprecated. Instead, use
-[`ses.getAllExtensions()`](session.md#sesgetallextensions).
-
 ### Instance Properties

 Objects created with `new BrowserWindow` have the following properties:
@@ -1051,7 +964,7 @@ Returns `Boolean` - Whether the window is in simple (pre-Lion) fullscreen mode.

 Returns `Boolean` - Whether the window is in normal state (not maximized, not minimized, not in fullscreen mode).

-#### `win.setAspectRatio(aspectRatio[, extraSize])` _macOS_ _Linux_
+#### `win.setAspectRatio(aspectRatio[, extraSize])`

 * `aspectRatio` Float - The aspect ratio to maintain for some portion of the
 content view.
@@ -1072,6 +985,9 @@ the player itself we would call this function with arguments of 16/9 and
 are within the content view--only that they exist. Sum any extra width and
 height areas you have within the overall content view.

+The aspect ratio is not respected when window is resized programmingly with
+APIs like `win.setSize`.
+
 #### `win.setBackgroundColor(backgroundColor)`

 * `backgroundColor` String - Window's background color as a hexadecimal value,
@@ -1384,7 +1300,7 @@ can be be used to listen to changes to tablet mode.

 #### `win.getMediaSourceId()`

-Returns `String` - Window id in the format of DesktopCapturerSource's id. For example "window:1234:0".
+Returns `String` - Window id in the format of DesktopCapturerSource's id. For example "window:1324:0".

 More precisely the format is `window:id:other_id` where `id` is `HWND` on
 Windows, `CGWindowID` (`uint64_t`) on macOS and `Window` (`unsigned long`) on
@@ -1402,6 +1318,8 @@ The native type of the handle is `HWND` on Windows, `NSView*` on macOS, and

 * `message` Integer
 * `callback` Function
+  * `wParam` any - The `wParam` provided to the WndProc
+  * `lParam` any - The `lParam` provided to the WndProc

 Hooks a windows message. The `callback` is called when
 the message is received in the WndProc.
@@ -1454,7 +1372,7 @@ Returns `Boolean` - Whether the window's document has been edited.

 Returns `Promise<NativeImage>` - Resolves with a [NativeImage](native-image.md)

-Captures a snapshot of the page within `rect`. Omitting `rect` will capture the whole visible page.
+Captures a snapshot of the page within `rect`. Omitting `rect` will capture the whole visible page. If the page is not visible, `rect` may be empty.

 #### `win.loadURL(url[, options])`

@@ -1463,7 +1381,7 @@ Captures a snapshot of the page within `rect`. Omitting `rect` will capture the
  * `httpReferrer` (String | [Referrer](structures/referrer.md)) (optional) - An HTTP Referrer URL.
  * `userAgent` String (optional) - A user agent originating the request.
  * `extraHeaders` String (optional) - Extra headers separated by "\n"
-  * `postData` ([UploadRawData[]](structures/upload-raw-data.md) | [UploadFile[]](structures/upload-file.md)) (optional)
+  * `postData` ([UploadRawData](structures/upload-raw-data.md) | [UploadFile](structures/upload-file.md))[] (optional)
  * `baseURLForDataURL` String (optional) - Base URL (with trailing path separator) for files to be loaded by the data URL. This is needed only if the specified `url` is a data URL and needs to load other files.

 Returns `Promise<void>` - the promise will resolve when the page has finished loading
@@ -1681,8 +1599,6 @@ Changes window icon.

 Sets whether the window traffic light buttons should be visible.

-This cannot be called when `titleBarStyle` is set to `customButtonsOnHover`.
-
 #### `win.setAutoHideMenuBar(hide)`

 * `hide` Boolean
@@ -1711,7 +1627,14 @@ Returns `Boolean` - Whether the menu bar is visible.
 * `visible` Boolean
 * `options` Object (optional)
  * `visibleOnFullScreen` Boolean (optional) _macOS_ - Sets whether
-    the window should be visible above fullscreen windows
+    the window should be visible above fullscreen windows.
+  * `skipTransformProcessType` Boolean (optional) _macOS_ - Calling
+    setVisibleOnAllWorkspaces will by default transform the process
+    type between UIElementApplication and ForegroundApplication to
+    ensure the correct behavior. However, this will hide the window
+    and dock for a short time every time it is called. If your window
+    is already of type UIElementApplication, you can bypass this
+    transformation by passing true to skipTransformProcessType.

 Sets whether the window should be visible on all workspaces.

@@ -1825,12 +1748,12 @@ deprecated and will be removed in an upcoming version of macOS.

 * `position` [Point](structures/point.md)

-Set a custom position for the traffic light buttons. Can only be used with `titleBarStyle` set to `hidden`.
+Set a custom position for the traffic light buttons in frameless window.

 #### `win.getTrafficLightPosition()` _macOS_

-Returns `Point` - The current position for the traffic light buttons. Can only be used with `titleBarStyle`
-set to `hidden`.
+Returns `Point` - The custom position for the traffic light buttons in
+frameless window.

 #### `win.setTouchBar(touchBar)` _macOS_

@@ -1864,6 +1787,13 @@ Replacement API for setBrowserView supporting work with multi browser views.

 * `browserView` [BrowserView](browser-view.md)

+#### `win.setTopBrowserView(browserView)` _Experimental_
+
+* `browserView` [BrowserView](browser-view.md)
+
+Raises `browserView` above other `BrowserView`s attached to `win`.
+Throws an error if `browserView` is not attached to `win`.
+
 #### `win.getBrowserViews()` _Experimental_

 Returns `BrowserView[]` - an array of all BrowserViews that have been attached
--- a/docs/api/client-request.md
+++ b/docs/api/client-request.md
@@ -71,7 +71,7 @@ const request = net.request({

 Returns:

-* `response` IncomingMessage - An object representing the HTTP response message.
+* `response` [IncomingMessage](incoming-message.md) - An object representing the HTTP response message.

 #### Event: 'login'

--- a/docs/api/command-line-switches.md
+++ b/docs/api/command-line-switches.md
@@ -65,12 +65,12 @@ Forces the maximum disk space to be used by the disk cache, in bytes.

 Enables caller stack logging for the following APIs (filtering events):

- `desktopCapturer.getSources()` / `desktop-capturer-get-sources`
- `remote.require()` / `remote-require`
- `remote.getGlobal()` / `remote-get-builtin`
- `remote.getBuiltin()` / `remote-get-global`
- `remote.getCurrentWindow()` / `remote-get-current-window`
- `remote.getCurrentWebContents()` / `remote-get-current-web-contents`
+* `desktopCapturer.getSources()` / `desktop-capturer-get-sources`
+* `remote.require()` / `remote-require`
+* `remote.getGlobal()` / `remote-get-builtin`
+* `remote.getBuiltin()` / `remote-get-global`
+* `remote.getCurrentWindow()` / `remote-get-current-window`
+* `remote.getCurrentWebContents()` / `remote-get-current-web-contents`

 ### --enable-logging

@@ -80,6 +80,12 @@ This switch can not be used in `app.commandLine.appendSwitch` since it is parsed
 earlier than user's app is loaded, but you can set the `ELECTRON_ENABLE_LOGGING`
 environment variable to achieve the same effect.

+### --force-fieldtrials=`trials`
+
+Field trials to be forcefully enabled or disabled.
+
+For example: `WebRTC-Audio-Red-For-Opus/Enabled/`
+
 ### --host-rules=`rules`

 A comma-separated list of `rules` that control how hostnames are mapped.
@@ -136,7 +142,8 @@ proxy server flags that are passed.

 ### --no-sandbox

-Disables Chromium sandbox, which is now enabled by default.
+Disables the Chromium [sandbox](https://www.chromium.org/developers/design-documents/sandbox).
+Forces renderer process and Chromium helper processes to run un-sandboxed.
 Should only be used for testing.

 ### --proxy-bypass-list=`hosts`
--- a/docs/api/content-tracing.md
+++ b/docs/api/content-tracing.md
@@ -16,7 +16,7 @@ const { app, contentTracing } = require('electron')
 app.whenReady().then(() => {
  (async () => {
    await contentTracing.startRecording({
-      include_categories: ['*']
+      included_categories: ['*']
    })
    console.log('Tracing started')
    await new Promise(resolve => setTimeout(resolve, 5000))
--- a/docs/api/context-bridge.md
+++ b/docs/api/context-bridge.md
@@ -33,7 +33,7 @@ page you load in your renderer executes code in this world.

 ### Isolated World

-When `contextIsolation` is enabled in your `webPreferences`, your `preload` scripts run in an
+When `contextIsolation` is enabled in your `webPreferences` (this is the default behavior since Electron 12.0.0), your `preload` scripts run in an
 "Isolated World".  You can read more about context isolation and what it affects in the
 [security](../tutorial/security.md#3-enable-context-isolation-for-remote-content) docs.

@@ -41,22 +41,22 @@ When `contextIsolation` is enabled in your `webPreferences`, your `preload` scri

 The `contextBridge` module has the following methods:

-### `contextBridge.exposeInMainWorld(apiKey, api)` _Experimental_
+### `contextBridge.exposeInMainWorld(apiKey, api)`

 * `apiKey` String - The key to inject the API onto `window` with.  The API will be accessible on `window[apiKey]`.
-* `api` Record<String, any> - Your API object, more information on what this API can be and how it works is available below.
+* `api` any - Your API, more information on what this API can be and how it works is available below.

 ## Usage

-### API Objects
+### API

-The `api` object provided to [`exposeInMainWorld`](#contextbridgeexposeinmainworldapikey-api-experimental) must be an object
+The `api` provided to [`exposeInMainWorld`](#contextbridgeexposeinmainworldapikey-api) must be a `Function`, `String`, `Number`, `Array`, `Boolean`, or an object
 whose keys are strings and values are a `Function`, `String`, `Number`, `Array`, `Boolean`, or another nested object that meets the same conditions.

 `Function` values are proxied to the other context and all other values are **copied** and **frozen**. Any data / primitives sent in
-the API object become immutable and updates on either side of the bridge do not result in an update on the other side.
+the API become immutable and updates on either side of the bridge do not result in an update on the other side.

-An example of a complex API object is shown below:
+An example of a complex API is shown below:

 ```javascript
 const { contextBridge } = require('electron')
@@ -106,6 +106,26 @@ has been included below for completeness:
 | `Promise` | Complex | ✅ | ✅ | Promises are only proxied if they are the return value or exact parameter.  Promises nested in arrays or objects will be dropped. |
 | `Function` | Complex | ✅ | ✅ | Prototype modifications are dropped.  Sending classes or constructors will not work. |
 | [Cloneable Types](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm) | Simple | ✅ | ✅ | See the linked document on cloneable types |
+| `Element` | Complex | ✅ | ✅ | Prototype modifications are dropped.  Sending custom elements will not work. |
 | `Symbol` | N/A | ❌ | ❌ | Symbols cannot be copied across contexts so they are dropped |

 If the type you care about is not in the above table, it is probably not supported.
+
+### Exposing Node Global Symbols
+
+The `contextBridge` can be used by the preload script to give your renderer access to Node APIs.
+The table of supported types described above also applies to Node APIs that you expose through `contextBridge`.
+Please note that many Node APIs grant access to local system resources.
+Be very cautious about which globals and APIs you expose to untrusted remote content.
+
+```javascript
+const { contextBridge } = require('electron')
+const crypto = require('crypto')
+contextBridge.exposeInMainWorld('nodeCrypto', {
+  sha256sum (data) {
+    const hash = crypto.createHash('sha256')
+    hash.update(data)
+    return hash.digest('hex')
+  }
+})
+```
--- a/docs/api/cookies.md
+++ b/docs/api/cookies.md
@@ -45,6 +45,8 @@ The following events are available on instances of `Cookies`:

 #### Event: 'changed'

+Returns:
+
 * `event` Event
 * `cookie` [Cookie](structures/cookie.md) - The cookie that was changed.
 * `cause` String - The cause of the change with one of the following values:
--- a/docs/api/crash-reporter.md
+++ b/docs/api/crash-reporter.md
@@ -77,7 +77,8 @@ The `crashReporter` module has the following methods:
 ### `crashReporter.start(options)`

 * `options` Object
-  * `submitURL` String - URL that crash reports will be sent to as POST.
+  * `submitURL` String (optional) - URL that crash reports will be sent to as
+    POST. Required unless `uploadToServer` is `false`.
  * `productName` String (optional) - Defaults to `app.name`.
  * `companyName` String (optional) _Deprecated_ - Deprecated alias for
    `{ globalExtra: { _companyName: ... } }`.
@@ -128,7 +129,7 @@ must be at most 39 bytes long, and values must be no longer than 127 bytes.
 Keys with names longer than the maximum will be silently ignored. Key values
 longer than the maximum length will be truncated.

-**Note:** Calling this method from the renderer process is deprecated.
+**Note:** This method is only available in the main process.

 ### `crashReporter.getLastCrashReport()`

@@ -137,7 +138,7 @@ last crash report. Only crash reports that have been uploaded will be returned;
 even if a crash report is present on disk it will not be returned until it is
 uploaded. In the case that there are no uploaded reports, `null` is returned.

-**Note:** Calling this method from the renderer process is deprecated.
+**Note:** This method is only available in the main process.

 ### `crashReporter.getUploadedReports()`

@@ -146,14 +147,14 @@ Returns [`CrashReport[]`](structures/crash-report.md):
 Returns all uploaded crash reports. Each report contains the date and uploaded
 ID.

-**Note:** Calling this method from the renderer process is deprecated.
+**Note:** This method is only available in the main process.

 ### `crashReporter.getUploadToServer()`

 Returns `Boolean` - Whether reports should be submitted to the server. Set through
 the `start` method or `setUploadToServer`.

-**Note:** Calling this method from the renderer process is deprecated.
+**Note:** This method is only available in the main process.

 ### `crashReporter.setUploadToServer(uploadToServer)`

@@ -162,13 +163,7 @@ the `start` method or `setUploadToServer`.
 This would normally be controlled by user preferences. This has no effect if
 called before `start` is called.

-**Note:** Calling this method from the renderer process is deprecated.
-
-### `crashReporter.getCrashesDirectory()` _Deprecated_
-
-Returns `String` - The directory where crashes are temporarily stored before being uploaded.
-
-**Note:** This method is deprecated, use `app.getPath('crashDumps')` instead.
+**Note:** This method is only available in the main process.

 ### `crashReporter.addExtraParameter(key, value)`

--- a/docs/api/dialog.md
+++ b/docs/api/dialog.md
@@ -24,7 +24,7 @@ The `dialog` module has the following methods:
  * `buttonLabel` String (optional) - Custom label for the confirmation button, when
    left empty the default label will be used.
  * `filters` [FileFilter[]](structures/file-filter.md) (optional)
-  * `properties` String[] (optional) - Contains which features the dialog should
+  * `properties` String[]&#32;(optional) - Contains which features the dialog should
    use. The following values are supported:
    * `openFile` - Allow files to be selected.
    * `openDirectory` - Allow directories to be selected.
@@ -87,7 +87,7 @@ dialog.showOpenDialogSync(mainWindow, {
  * `buttonLabel` String (optional) - Custom label for the confirmation button, when
    left empty the default label will be used.
  * `filters` [FileFilter[]](structures/file-filter.md) (optional)
-  * `properties` String[] (optional) - Contains which features the dialog should
+  * `properties` String[]&#32;(optional) - Contains which features the dialog should
    use. The following values are supported:
    * `openFile` - Allow files to be selected.
    * `openDirectory` - Allow directories to be selected.
@@ -112,7 +112,7 @@ Returns `Promise<Object>` - Resolve with an object containing the following:

 * `canceled` Boolean - whether or not the dialog was canceled.
 * `filePaths` String[] - An array of file paths chosen by the user. If the dialog is cancelled this will be an empty array.
-* `bookmarks` String[] (optional) _macOS_ _mas_ - An array matching the `filePaths` array of base64 encoded strings which contains security scoped bookmark data. `securityScopedBookmarks` must be enabled for this to be populated. (For return values, see [table here](#bookmarks-array).)
+* `bookmarks` String[]&#32;(optional) _macOS_ _mas_ - An array matching the `filePaths` array of base64 encoded strings which contains security scoped bookmark data. `securityScopedBookmarks` must be enabled for this to be populated. (For return values, see [table here](#bookmarks-array).)

 The `browserWindow` argument allows the dialog to attach itself to a parent window, making it modal.

@@ -154,7 +154,7 @@ dialog.showOpenDialog(mainWindow, {

 * `browserWindow` [BrowserWindow](browser-window.md) (optional)
 * `options` Object
-  * `title` String (optional)
+  * `title` String (optional) - The dialog title. Cannot be displayed on some _Linux_ desktop environments.
  * `defaultPath` String (optional) - Absolute directory path, absolute file
    path, or file name to use by default.
  * `buttonLabel` String (optional) - Custom label for the confirmation button, when
@@ -165,7 +165,7 @@ dialog.showOpenDialog(mainWindow, {
    displayed in front of the filename text field.
  * `showsTagField` Boolean (optional) _macOS_ - Show the tags input box,
    defaults to `true`.
-  * `properties` String[] (optional)
+  * `properties` String[]&#32;(optional)
    * `showHiddenFiles` - Show hidden files in dialog.
    * `createDirectory` _macOS_ - Allow creating new directories from dialog.
    * `treatPackageAsDirectory` _macOS_ - Treat packages, such as `.app` folders,
@@ -185,7 +185,7 @@ The `filters` specifies an array of file types that can be displayed, see

 * `browserWindow` [BrowserWindow](browser-window.md) (optional)
 * `options` Object
-  * `title` String (optional)
+  * `title` String (optional) - The dialog title. Cannot be displayed on some _Linux_ desktop environments.
  * `defaultPath` String (optional) - Absolute directory path, absolute file
    path, or file name to use by default.
  * `buttonLabel` String (optional) - Custom label for the confirmation button, when
@@ -195,7 +195,7 @@ The `filters` specifies an array of file types that can be displayed, see
  * `nameFieldLabel` String (optional) _macOS_ - Custom label for the text
    displayed in front of the filename text field.
  * `showsTagField` Boolean (optional) _macOS_ - Show the tags input box, defaults to `true`.
-  * `properties` String[] (optional)
+  * `properties` String[]&#32;(optional)
    * `showHiddenFiles` - Show hidden files in dialog.
    * `createDirectory` _macOS_ - Allow creating new directories from dialog.
    * `treatPackageAsDirectory` _macOS_ - Treat packages, such as `.app` folders,
@@ -227,7 +227,7 @@ expanding and collapsing the dialog.
  `"warning"`. On Windows, `"question"` displays the same icon as `"info"`, unless
  you set an icon using the `"icon"` option. On macOS, both `"warning"` and
  `"error"` display the same warning icon.
-  * `buttons` String[] (optional) - Array of texts for buttons. On Windows, an empty array
+  * `buttons` String[]&#32;(optional) - Array of texts for buttons. On Windows, an empty array
    will result in one button labeled "OK".
  * `defaultId` Integer (optional) - Index of the button in the buttons array which will
    be selected by default when the message box opens.
@@ -273,7 +273,7 @@ If `browserWindow` is not shown dialog will not be attached to it. In such case
  `"warning"`. On Windows, `"question"` displays the same icon as `"info"`, unless
  you set an icon using the `"icon"` option. On macOS, both `"warning"` and
  `"error"` display the same warning icon.
-  * `buttons` String[] (optional) - Array of texts for buttons. On Windows, an empty array
+  * `buttons` String[]&#32;(optional) - Array of texts for buttons. On Windows, an empty array
    will result in one button labeled "OK".
  * `defaultId` Integer (optional) - Index of the button in the buttons array which will
    be selected by default when the message box opens.
--- a/docs/api/environment-variables.md
+++ b/docs/api/environment-variables.md
@@ -120,6 +120,24 @@ debugging purposes.

 Prints Chrome's internal logging to the console.

+### `ELECTRON_DEBUG_DRAG_REGIONS`
+
+Adds coloration to draggable regions on [`BrowserView`](./browser-view.md)s on macOS - draggable regions will be colored
+green and non-draggable regions will be colored red to aid debugging.
+
+### `ELECTRON_DEBUG_NOTIFICATIONS`
+
+Adds extra logs to [`Notification`](./notification.md) lifecycles on macOS to aid in debugging. Extra logging will be displayed when new Notifications are created or activated. They will also be displayed when common actions are taken: a notification is shown, dismissed, its button is clicked, or it is replied to.
+
+Sample output:
+
+```sh
+Notification created (com.github.Electron:notification:EAF7B87C-A113-43D7-8E76-F88EC9D73D44)
+Notification displayed (com.github.Electron:notification:EAF7B87C-A113-43D7-8E76-F88EC9D73D44)
+Notification activated (com.github.Electron:notification:EAF7B87C-A113-43D7-8E76-F88EC9D73D44)
+Notification replied to (com.github.Electron:notification:EAF7B87C-A113-43D7-8E76-F88EC9D73D44)
+```
+
 ### `ELECTRON_LOG_ASAR_READS`

 When Electron reads from an ASAR file, log the read offset and file path to
--- a/docs/api/extensions.md
+++ b/docs/api/extensions.md
@@ -15,7 +15,7 @@ extension capabilities.

 Electron only supports loading unpacked extensions (i.e., `.crx` files do not
 work). Extensions are installed per-`session`. To load an extension, call
-[`ses.loadExtension`](session.md#sesloadextensionpath):
+[`ses.loadExtension`](session.md#sesloadextensionpath-options):

 ```js
 const { session } = require('electron')
@@ -115,3 +115,9 @@ The following methods of `chrome.management` are supported:
 - `chrome.management.getPermissionWarningsByManifest`
 - `chrome.management.onEnabled`
 - `chrome.management.onDisabled`
+
+### `chrome.webRequest`
+
+All features of this API are supported.
+
+> **NOTE:** Electron's [`webRequest`](web-request.md) module takes precedence over `chrome.webRequest` if there are conflicting handlers.
--- a/docs/api/frameless-window.md
+++ b/docs/api/frameless-window.md
@@ -82,8 +82,11 @@ win.show()
 * The `blur` filter only applies to the web page, so there is no way to apply
  blur effect to the content below the window (i.e. other applications open on
  the user's system).
-* On Windows operating systems, transparent windows will not work when DWM is
+* The window will not be transparent when DevTools is opened.
+* On Windows operating systems,
+  * transparent windows will not work when DWM is
  disabled.
+  * transparent windows can not be maximized using the Windows system menu or by double clicking the title bar. The reasoning behind this can be seen on [this pull request](https://github.com/electron/electron/pull/28207).
 * On Linux, users have to put `--enable-transparent-visuals --disable-gpu` in
  the command line to disable GPU and allow ARGB to make transparent window,
  this is caused by an upstream bug that [alpha channel doesn't work on some
--- a/docs/api/global-shortcut.md
+++ b/docs/api/global-shortcut.md
@@ -9,7 +9,7 @@ with the operating system so that you can customize the operations for various
 shortcuts.

 **Note:** The shortcut is global; it will work even if the app does
-not have the keyboard focus. You should not use this module until the `ready`
+not have the keyboard focus. This module cannot be used before the `ready`
 event of the app module is emitted.

 ```javascript
--- a/docs/api/ipc-main.md
+++ b/docs/api/ipc-main.md
@@ -120,6 +120,11 @@ The `event` that is passed as the first argument to the handler is the same as
 that passed to a regular event listener. It includes information about which
 WebContents is the source of the invoke request.

+Errors thrown through `handle` in the main process are not transparent as they
+are serialized and only the `message` property from the original error is
+provided to the renderer process. Please refer to
+[#24427](https://github.com/electron/electron/issues/24427) for details.
+
 ### `ipcMain.handleOnce(channel, listener)`

 * `channel` String
--- a/docs/api/ipc-renderer.md
+++ b/docs/api/ipc-renderer.md
@@ -62,10 +62,9 @@ included. Sending Functions, Promises, Symbols, WeakMaps, or WeakSets will
 throw an exception.

 > **NOTE:** Sending non-standard JavaScript types such as DOM objects or
-> special Electron objects is deprecated, and will begin throwing an exception
-> starting with Electron 9.
-
-> **NOTE:** Since the main process does not have support for DOM objects such as
+> special Electron objects will throw an exception.
+>
+> Since the main process does not have support for DOM objects such as
 > `ImageBitmap`, `File`, `DOMMatrix` and so on, such objects cannot be sent over
 > Electron's IPC to the main process, as the main process would have no way to decode
 > them. Attempting to send such objects over IPC will result in an error.
@@ -90,11 +89,10 @@ Algorithm][SCA], just like [`window.postMessage`][], so prototype chains will no
 included. Sending Functions, Promises, Symbols, WeakMaps, or WeakSets will
 throw an exception.

-> **NOTE**: Sending non-standard JavaScript types such as DOM objects or
-> special Electron objects is deprecated, and will begin throwing an exception
-> starting with Electron 9.
-
-> **NOTE:** Since the main process does not have support for DOM objects such as
+> **NOTE:** Sending non-standard JavaScript types such as DOM objects or
+> special Electron objects will throw an exception.
+>
+> Since the main process does not have support for DOM objects such as
 > `ImageBitmap`, `File`, `DOMMatrix` and so on, such objects cannot be sent over
 > Electron's IPC to the main process, as the main process would have no way to decode
 > them. Attempting to send such objects over IPC will result in an error.
@@ -134,11 +132,10 @@ Algorithm][SCA], just like [`window.postMessage`][], so prototype chains will no
 included. Sending Functions, Promises, Symbols, WeakMaps, or WeakSets will
 throw an exception.

-> **NOTE**: Sending non-standard JavaScript types such as DOM objects or
-> special Electron objects is deprecated, and will begin throwing an exception
-> starting with Electron 9.
-
-> **NOTE:** Since the main process does not have support for DOM objects such as
+> **NOTE:** Sending non-standard JavaScript types such as DOM objects or
+> special Electron objects will throw an exception.
+>
+> Since the main process does not have support for DOM objects such as
 > `ImageBitmap`, `File`, `DOMMatrix` and so on, such objects cannot be sent over
 > Electron's IPC to the main process, as the main process would have no way to decode
 > them. Attempting to send such objects over IPC will result in an error.
--- a/docs/api/locales.md
+++ b/docs/api/locales.md
@@ -1,142 +0,0 @@
-# Locales
-
-> Locale values returned by `app.getLocale()`.
-
-Electron uses Chromium's `l10n_util` library to fetch the locale. Possible
-values are listed below:
-
-| Language Code | Language Name |
-|---------------|---------------|
-| af | Afrikaans |
-| am | Amharic |
-| ar | Arabic |
-| az | Azerbaijani |
-| be | Belarusian |
-| bg | Bulgarian |
-| bh | Bihari |
-| bn | Bengali |
-| br | Breton |
-| bs | Bosnian |
-| ca | Catalan |
-| co | Corsican |
-| cs | Czech |
-| cy | Welsh |
-| da | Danish |
-| de | German |
-| de-AT | German (Austria) |
-| de-CH | German (Switzerland) |
-| de-DE | German (Germany) |
-| el | Greek |
-| en | English |
-| en-AU | English (Australia) |
-| en-CA | English (Canada) |
-| en-GB | English (UK) |
-| en-NZ | English (New Zealand) |
-| en-US | English (US) |
-| en-ZA | English (South Africa) |
-| eo | Esperanto |
-| es | Spanish |
-| es-419 | Spanish (Latin America) |
-| et | Estonian |
-| eu | Basque |
-| fa | Persian |
-| fi | Finnish |
-| fil | Filipino |
-| fo | Faroese |
-| fr | French |
-| fr-CA | French (Canada) |
-| fr-CH | French (Switzerland) |
-| fr-FR | French (France) |
-| fy | Frisian |
-| ga | Irish |
-| gd | Scots Gaelic |
-| gl | Galician |
-| gn | Guarani |
-| gu | Gujarati |
-| ha | Hausa |
-| haw | Hawaiian |
-| he | Hebrew |
-| hi | Hindi |
-| hr | Croatian |
-| hu | Hungarian |
-| hy | Armenian |
-| ia | Interlingua |
-| id | Indonesian |
-| is | Icelandic |
-| it | Italian |
-| it-CH | Italian (Switzerland) |
-| it-IT | Italian (Italy) |
-| ja | Japanese |
-| jw | Javanese |
-| ka | Georgian |
-| kk | Kazakh |
-| km | Cambodian |
-| kn | Kannada |
-| ko | Korean |
-| ku | Kurdish |
-| ky | Kyrgyz |
-| la | Latin |
-| ln | Lingala |
-| lo | Laothian |
-| lt | Lithuanian |
-| lv | Latvian |
-| mk | Macedonian |
-| ml | Malayalam |
-| mn | Mongolian |
-| mo | Moldavian |
-| mr | Marathi |
-| ms | Malay |
-| mt | Maltese |
-| nb | Norwegian (Bokmal) |
-| ne | Nepali |
-| nl | Dutch |
-| nn | Norwegian (Nynorsk) |
-| no | Norwegian |
-| oc | Occitan |
-| om | Oromo |
-| or | Oriya |
-| pa | Punjabi |
-| pl | Polish |
-| ps | Pashto |
-| pt | Portuguese |
-| pt-BR | Portuguese (Brazil) |
-| pt-PT | Portuguese (Portugal) |
-| qu | Quechua |
-| rm | Romansh |
-| ro | Romanian |
-| ru | Russian |
-| sd | Sindhi |
-| sh | Serbo-Croatian |
-| si | Sinhalese |
-| sk | Slovak |
-| sl | Slovenian |
-| sn | Shona |
-| so | Somali |
-| sq | Albanian |
-| sr | Serbian |
-| st | Sesotho |
-| su | Sundanese |
-| sv | Swedish |
-| sw | Swahili |
-| ta | Tamil |
-| te | Telugu |
-| tg | Tajik |
-| th | Thai |
-| ti | Tigrinya |
-| tk | Turkmen |
-| to | Tonga |
-| tr | Turkish |
-| tt | Tatar |
-| tw | Twi |
-| ug | Uighur |
-| uk | Ukrainian |
-| ur | Urdu |
-| uz | Uzbek |
-| vi | Vietnamese |
-| xh | Xhosa |
-| yi | Yiddish |
-| yo | Yoruba |
-| zh | Chinese |
-| zh-CN | Chinese (Simplified) |
-| zh-TW | Chinese (Traditional) |
-| zu | Zulu |
--- a/docs/api/menu.md
+++ b/docs/api/menu.md
@@ -1,3 +1,5 @@
+# Menu
+
 ## Class: Menu

 > Create native application menus and context menus.
@@ -22,8 +24,10 @@ Sets `menu` as the application menu on macOS. On Windows and Linux, the
 Also on Windows and Linux, you can use a `&` in the top-level item name to
 indicate which letter should get a generated accelerator. For example, using
 `&File` for the file menu would result in a generated `Alt-F` accelerator that
-opens the associated menu. The indicated character in the button label gets an
-underline. The `&` character is not displayed on the button label.
+opens the associated menu. The indicated character in the button label then gets an
+underline, and the `&` character is not displayed on the button label.
+
+In order to escape the `&` character in an item name, add a proceeding `&`. For example, `&&File` would result in `&File` displayed on the button label.

 Passing `null` will suppress the default menu. On Windows and Linux,
 this has the additional effect of removing the menu bar from the window.
@@ -158,7 +162,7 @@ const template = [
      { role: 'services' },
      { type: 'separator' },
      { role: 'hide' },
-      { role: 'hideothers' },
+      { role: 'hideOthers' },
      { role: 'unhide' },
      { type: 'separator' },
      { role: 'quit' }
--- a/docs/api/message-channel-main.md
+++ b/docs/api/message-channel-main.md
@@ -9,12 +9,15 @@ channel messaging.

 ## Class: MessageChannelMain

+> Channel interface for channel messaging in the main process.
+
 Process: [Main](../glossary.md#main-process)

 Example:

 ```js
 // Main process
+const { MessageChannelMain } = require('electron')
 const { port1, port2 } = new MessageChannelMain()
 w.webContents.postMessage('port', null, [port2])
 port1.postMessage({ some: 'message' })
--- a/docs/api/message-port-main.md
+++ b/docs/api/message-port-main.md
@@ -14,6 +14,8 @@ channel messaging.

 ## Class: MessagePortMain

+> Port interface for channel messaging in the main process.
+
 Process: [Main](../glossary.md#main-process)

 ### Instance Methods
--- a/docs/api/modernization/overview.md
+++ b/docs/api/modernization/overview.md
@@ -1,10 +0,0 @@
-## Modernization
-
-The Electron team is currently undergoing an initiative to modernize our API in a few concrete ways. These include: updating our modules to use idiomatic JS properties instead of separate `getPropertyX` and `setPropertyX`, converting callbacks to promises, and removing some other anti-patterns present in our APIs. The current status of the Promise initiative can be tracked in the [promisification](promisification.md) tracking file.
-
-As we work to perform these updates, we seek to create the least disruptive amount of change at any given time, so as many changes as possible will be introduced in a backward compatible manner and deprecated after enough time has passed to give users a chance to upgrade their API calls.
-
-This document and its child documents will be updated to reflect the latest status of our API changes.
-
-* [Promisification](promisification.md)
-* [Property Updates](property-updates.md)
--- a/docs/api/modernization/promisification.md
+++ b/docs/api/modernization/promisification.md
@@ -1,42 +0,0 @@
-## Promisification
-
-The Electron team recently underwent an initiative to convert callback-based APIs to Promise-based ones. See converted functions below:
-
- [app.getFileIcon(path[, options], callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#getFileIcon)
- [contents.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#capturePage)
- [contents.executeJavaScript(code[, userGesture, callback])](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#executeJavaScript)
- [contents.printToPDF(options, callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#printToPDF)
- [contents.savePage(fullPath, saveType, callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#savePage)
- [contentTracing.getCategories(callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#getCategories)
- [contentTracing.startRecording(options, callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#startRecording)
- [contentTracing.stopRecording(resultFilePath, callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#stopRecording)
- [contentTracing.getTraceBufferUsage(callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#getTraceBufferUsage)
- [cookies.flushStore(callback)](https://github.com/electron/electron/blob/master/docs/api/cookies.md#flushStore)
- [cookies.get(filter, callback)](https://github.com/electron/electron/blob/master/docs/api/cookies.md#get)
- [cookies.remove(url, name, callback)](https://github.com/electron/electron/blob/master/docs/api/cookies.md#remove)
- [cookies.set(details, callback)](https://github.com/electron/electron/blob/master/docs/api/cookies.md#set)
- [debugger.sendCommand(method[, commandParams, callback])](https://github.com/electron/electron/blob/master/docs/api/debugger.md#sendCommand)
- [desktopCapturer.getSources(options, callback)](https://github.com/electron/electron/blob/master/docs/api/desktop-capturer.md#getSources)
- [dialog.showOpenDialog([browserWindow, ]options[, callback])](https://github.com/electron/electron/blob/master/docs/api/dialog.md#showOpenDialog)
- [dialog.showSaveDialog([browserWindow, ]options[, callback])](https://github.com/electron/electron/blob/master/docs/api/dialog.md#showSaveDialog)
- [inAppPurchase.purchaseProduct(productID, quantity, callback)](https://github.com/electron/electron/blob/master/docs/api/in-app-purchase.md#purchaseProduct)
- [inAppPurchase.getProducts(productIDs, callback)](https://github.com/electron/electron/blob/master/docs/api/in-app-purchase.md#getProducts)
- [dialog.showMessageBox([browserWindow, ]options[, callback])](https://github.com/electron/electron/blob/master/docs/api/dialog.md#showMessageBox)
- [dialog.showCertificateTrustDialog([browserWindow, ]options, callback)](https://github.com/electron/electron/blob/master/docs/api/dialog.md#showCertificateTrustDialog)
- [netLog.stopLogging([callback])](https://github.com/electron/electron/blob/master/docs/api/net-log.md#stopLogging)
- [protocol.isProtocolHandled(scheme, callback)](https://github.com/electron/electron/blob/master/docs/api/protocol.md#isProtocolHandled)
- [ses.clearHostResolverCache([callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearHostResolverCache)
- [ses.clearStorageData([options, callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearStorageData)
- [ses.setProxy(config, callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#setProxy)
- [ses.resolveProxy(url, callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#resolveProxy)
- [ses.getCacheSize(callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#getCacheSize)
- [ses.clearAuthCache(options[, callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearAuthCache)
- [ses.clearCache(callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#clearCache)
- [ses.getBlobData(identifier, callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#getBlobData)
- [shell.openExternal(url[, options, callback])](https://github.com/electron/electron/blob/master/docs/api/shell.md#openExternal)
- [webFrame.executeJavaScript(code[, userGesture, callback])](https://github.com/electron/electron/blob/master/docs/api/web-frame.md#executeJavaScript)
- [webFrame.executeJavaScriptInIsolatedWorld(worldId, scripts[, userGesture, callback])](https://github.com/electron/electron/blob/master/docs/api/web-frame.md#executeJavaScriptInIsolatedWorld)
- [webviewTag.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/webview-tag.md#capturePage)
- [webviewTag.executeJavaScript(code[, userGesture, callback])](https://github.com/electron/electron/blob/master/docs/api/webview-tag.md#executeJavaScript)
- [webviewTag.printToPDF(options, callback)](https://github.com/electron/electron/blob/master/docs/api/webview-tag.md#printToPDF)
- [win.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/browser-window.md#capturePage)
--- a/docs/api/modernization/property-updates.md
+++ b/docs/api/modernization/property-updates.md
@@ -1,41 +0,0 @@
-## Property Updates
-
-The Electron team is currently undergoing an initiative to convert separate getter and setter functions in Electron to bespoke properties with `get` and `set` functionality. During this transition period, both the new properties and old getters and setters of these functions will work correctly and be documented.
-
-## Candidates
-
-* `BrowserWindow`
-  * `menubarVisible`
-* `crashReporter` module
-  * `uploadToServer`
-* `webFrame` modules
-  * `zoomFactor`
-  * `zoomLevel`
-  * `audioMuted`
-* `<webview>`
-  * `zoomFactor`
-  * `zoomLevel`
-  * `audioMuted`
-
-## Converted Properties
-
-* `app` module
-  * `accessibilitySupport`
-  * `applicationMenu`
-  * `badgeCount`
-  * `name`
-* `DownloadItem` class
-  * `savePath`
-* `BrowserWindow` module
-  * `autoHideMenuBar`
-  * `resizable`
-  * `maximizable`
-  * `minimizable`
-  * `fullscreenable`
-  * `movable`
-  * `closable`
-  * `backgroundThrottling`
-* `NativeImage`
-  * `isMacTemplateImage`
-* `SystemPreferences` module
-  * `appLevelAppearance`
--- a/docs/api/process.md
+++ b/docs/api/process.md
@@ -12,28 +12,31 @@ It adds the following events, properties, and methods:

 In sandboxed renderers the `process` object contains only a subset of the APIs:

- `crash()`
- `hang()`
- `getCreationTime()`
- `getHeapStatistics()`
- `getBlinkMemoryInfo()`
- `getProcessMemoryInfo()`
- `getSystemMemoryInfo()`
- `getSystemVersion()`
- `getCPUUsage()`
- `getIOCounters()`
- `argv`
- `execPath`
- `env`
- `pid`
- `arch`
- `platform`
- `sandboxed`
- `type`
- `version`
- `versions`
- `mas`
- `windowsStore`
+* `crash()`
+* `hang()`
+* `getCreationTime()`
+* `getHeapStatistics()`
+* `getBlinkMemoryInfo()`
+* `getProcessMemoryInfo()`
+* `getSystemMemoryInfo()`
+* `getSystemVersion()`
+* `getCPUUsage()`
+* `getIOCounters()`
+* `uptime()`
+* `argv`
+* `execPath`
+* `env`
+* `pid`
+* `arch`
+* `platform`
+* `sandboxed`
+* `contextIsolated`
+* `type`
+* `version`
+* `versions`
+* `mas`
+* `windowsStore`
+* `contextId`

 ## Events

@@ -42,19 +45,6 @@ In sandboxed renderers the `process` object contains only a subset of the APIs:
 Emitted when Electron has loaded its internal initialization script and is
 beginning to load the web page or the main script.

-It can be used by the preload script to add removed Node global symbols back to
-the global scope when node integration is turned off:
-
-```javascript
-// preload.js
-const _setImmediate = setImmediate
-const _clearImmediate = clearImmediate
-process.once('loaded', () => {
-  global.setImmediate = _setImmediate
-  global.clearImmediate = _clearImmediate
-})
-```
-
 ## Properties

 ### `process.defaultApp` _Readonly_
@@ -92,6 +82,11 @@ A `String` representing the path to the resources directory.
 A `Boolean`. When the renderer process is sandboxed, this property is `true`,
 otherwise it is `undefined`.

+### `process.contextIsolated` _Readonly_
+
+A `Boolean` that indicates whether the current renderer context has `contextIsolation` enabled.
+It is `undefined` in the main process.
+
 ### `process.throwDeprecation`

 A `Boolean` that controls whether or not deprecation warnings will be thrown as
@@ -132,6 +127,13 @@ A `String` representing Electron's version string.
 A `Boolean`. If the app is running as a Windows Store app (appx), this property is `true`,
 for otherwise it is `undefined`.

+### `process.contextId` _Readonly_
+
+A `String` (optional) representing a globally unique ID of the current JavaScript context.
+Each frame has its own JavaScript context. When contextIsolation is enabled, the isolated
+world also has a separate JavaScript context.
+This property is only available in the renderer process.
+
 ## Methods

 The `process` object has the following methods:
--- a/docs/api/remote.md
+++ b/docs/api/remote.md
@@ -36,8 +36,8 @@ you can use [webContents.executeJavaScript](web-contents.md#contentsexecutejavas

 **Note:** The remote module can be disabled for security reasons in the following contexts:

- [`BrowserWindow`](browser-window.md) - by setting the `enableRemoteModule` option to `false`.
- [`<webview>`](webview-tag.md) - by setting the `enableremotemodule` attribute to `false`.
+* [`BrowserWindow`](browser-window.md) - by setting the `enableRemoteModule` option to `false`.
+* [`<webview>`](webview-tag.md) - by setting the `enableremotemodule` attribute to `false`.

 ## Remote Objects

--- a/docs/api/sandbox-option.md
+++ b/docs/api/sandbox-option.md
@@ -1,182 +0,0 @@
-# `sandbox` Option
-
-> Create a browser window with a sandboxed renderer. With this
-option enabled, the renderer must communicate via IPC to the main process in order to access node APIs.
-
-One of the key security features of Chromium is that all blink rendering/JavaScript
-code is executed within a sandbox. This sandbox uses OS-specific features to ensure
-that exploits in the renderer process cannot harm the system.
-
-In other words, when the sandbox is enabled, the renderers can only make changes
-to the system by delegating tasks to the main process via IPC.
-[Here's](https://www.chromium.org/developers/design-documents/sandbox) more
-information about the sandbox.
-
-Since a major feature in Electron is the ability to run Node.js in the
-renderer process (making it easier to develop desktop applications using web
-technologies), the sandbox is disabled by electron. This is because
-most Node.js APIs require system access. `require()` for example, is not
-possible without file system permissions, which are not available in a sandboxed
-environment.
-
-Usually this is not a problem for desktop applications since the code is always
-trusted, but it makes Electron less secure than Chromium for displaying
-untrusted web content. For applications that require more security, the
-`sandbox` flag will force Electron to spawn a classic Chromium renderer that is
-compatible with the sandbox.
-
-A sandboxed renderer doesn't have a Node.js environment running and doesn't
-expose Node.js JavaScript APIs to client code. The only exception is the preload script,
-which has access to a subset of the Electron renderer API.
-
-Another difference is that sandboxed renderers don't modify any of the default
-JavaScript APIs. Consequently, some APIs such as `window.open` will work as they
-do in Chromium (i.e. they do not return a [`BrowserWindowProxy`](browser-window-proxy.md)).
-
-## Example
-
-To create a sandboxed window, pass `sandbox: true` to `webPreferences`:
-
-```js
-let win
-app.whenReady().then(() => {
-  win = new BrowserWindow({
-    webPreferences: {
-      sandbox: true
-    }
-  })
-  win.loadURL('http://google.com')
-})
-```
-
-In the above code the [`BrowserWindow`](browser-window.md) that was created has Node.js disabled and can communicate
-only via IPC. The use of this option stops Electron from creating a Node.js runtime in the renderer. Also,
-within this new window `window.open` follows the native behavior (by default Electron creates a [`BrowserWindow`](browser-window.md)
-and returns a proxy to this via `window.open`).
-
-[`app.enableSandbox`](app.md#appenablesandbox) can be used to force `sandbox: true` for all `BrowserWindow` instances.
-
-```js
-let win
-app.enableSandbox()
-app.whenReady().then(() => {
-  // no need to pass `sandbox: true` since `app.enableSandbox()` was called.
-  win = new BrowserWindow()
-  win.loadURL('http://google.com')
-})
-```
-
-## Preload
-
-An app can make customizations to sandboxed renderers using a preload script.
-Here's an example:
-
-```js
-let win
-app.whenReady().then(() => {
-  win = new BrowserWindow({
-    webPreferences: {
-      sandbox: true,
-      preload: path.join(app.getAppPath(), 'preload.js')
-    }
-  })
-  win.loadURL('http://google.com')
-})
-```
-
-and preload.js:
-
-```js
-// This file is loaded whenever a javascript context is created. It runs in a
-// private scope that can access a subset of Electron renderer APIs. Without
-// contextIsolation enabled, it's possible to accidentally leak privileged
-// globals like ipcRenderer to web content.
-const { ipcRenderer } = require('electron')
-
-const defaultWindowOpen = window.open
-
-window.open = function customWindowOpen (url, ...args) {
-  ipcRenderer.send('report-window-open', location.origin, url, args)
-  return defaultWindowOpen(url + '?from_electron=1', ...args)
-}
-```
-
-Important things to notice in the preload script:
-
- Even though the sandboxed renderer doesn't have Node.js running, it still has
-  access to a limited node-like environment: `Buffer`, `process`, `setImmediate`,
-  `clearImmediate` and `require` are available.
- The preload script must be contained in a single script, but it is possible to have
-  complex preload code composed with multiple modules by using a tool like
-  webpack or browserify. An example of using browserify is below.
-
-To create a browserify bundle and use it as a preload script, something like
-the following should be used:
-
-```sh
-  browserify preload/index.js \
-    -x electron \
-    --insert-global-vars=__filename,__dirname -o preload.js
-```
-
-The `-x` flag should be used with any required module that is already exposed in
-the preload scope, and tells browserify to use the enclosing `require` function
-for it. `--insert-global-vars` will ensure that `process`, `Buffer` and
-`setImmediate` are also taken from the enclosing scope(normally browserify
-injects code for those).
-
-Currently the `require` function provided in the preload scope exposes the
-following modules:
-
- `electron`
-  - `crashReporter`
-  - `desktopCapturer`
-  - `ipcRenderer`
-  - `nativeImage`
-  - `webFrame`
- `events`
- `timers`
- `url`
-
-More may be added as needed to expose more Electron APIs in the sandbox.
-
-## Rendering untrusted content
-
-Rendering untrusted content in Electron is still somewhat uncharted territory,
-though some apps are finding success (e.g. Beaker Browser). Our goal is to get
-as close to Chrome as we can in terms of the security of sandboxed content, but
-ultimately we will always be behind due to a few fundamental issues:
-
-1. We do not have the dedicated resources or expertise that Chromium has to
-   apply to the security of its product. We do our best to make use of what we
-   have, to inherit everything we can from Chromium, and to respond quickly to
-   security issues, but Electron cannot be as secure as Chromium without the
-   resources that Chromium is able to dedicate.
-2. Some security features in Chrome (such as Safe Browsing and Certificate
-   Transparency) require a centralized authority and dedicated servers, both of
-   which run counter to the goals of the Electron project. As such, we disable
-   those features in Electron, at the cost of the associated security they
-   would otherwise bring.
-3. There is only one Chromium, whereas there are many thousands of apps built
-   on Electron, all of which behave slightly differently. Accounting for those
-   differences can yield a huge possibility space, and make it challenging to
-   ensure the security of the platform in unusual use cases.
-4. We can't push security updates to users directly, so we rely on app vendors
-   to upgrade the version of Electron underlying their app in order for
-   security updates to reach users.
-
-Here are some things to consider before rendering untrusted content:
-
- A preload script can accidentally leak privileged APIs to untrusted code,
-  unless [`contextIsolation`](../tutorial/security.md#3-enable-context-isolation-for-remote-content)
-  is also enabled.
- Some bug in the V8 engine may allow malicious code to access the renderer
-  preload APIs, effectively granting full access to the system through the
-  `remote` module. Therefore, it is highly recommended to [disable the `remote`
-  module](../tutorial/security.md#15-disable-the-remote-module).
-  If disabling is not feasible, you should selectively [filter the `remote`
-  module](../tutorial/security.md#16-filter-the-remote-module).
- While we make our best effort to backport Chromium security fixes to older
-  versions of Electron, we do not make a guarantee that every fix will be
-  backported. Your best chance at staying secure is to be on the latest stable
-  version of Electron.
--- a/docs/api/screen.md
+++ b/docs/api/screen.md
@@ -92,6 +92,8 @@ Returns [`Point`](structures/point.md)

 The current absolute position of the mouse pointer.

+**Note:** The return value is a DIP point, not a screen physical point.
+
 ### `screen.getPrimaryDisplay()`

 Returns [`Display`](structures/display.md) - The primary display.
--- a/docs/api/service-workers.md
+++ b/docs/api/service-workers.md
@@ -45,6 +45,16 @@ Returns:

 Emitted when a service worker logs something to the console.

+#### Event: 'registration-completed'
+
+Returns:
+
+* `event` Event
+* `details` Object - Information about the registered service worker
+  * `scope` String - The base URL that a service worker is registered for
+
+Emitted when a service worker has been registered. Can occur after a call to [`navigator.serviceWorker.register('/sw.js')`](https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register) successfully resolves or when a Chrome extension is loaded.
+
 ### Instance Methods

 The following methods are available on instances of `ServiceWorkers`:
--- a/docs/api/session.md
+++ b/docs/api/session.md
@@ -101,8 +101,8 @@ Returns:
 Emitted after an extension is loaded. This occurs whenever an extension is
 added to the "enabled" set of extensions. This includes:

- Extensions being loaded from `Session.loadExtension`.
- Extensions being reloaded:
+* Extensions being loaded from `Session.loadExtension`.
+* Extensions being reloaded:
  * from a crash.
  * if the extension requested it ([`chrome.runtime.reload()`](https://developer.chrome.com/extensions/runtime#method-reload)).

@@ -215,15 +215,15 @@ app.whenReady().then(() => {
      enableBlinkFeatures: 'Serial'
    }
  })
-  win.webContents.session.on('select-serial-port', (event, portList, callback) => {
+  win.webContents.session.on('select-serial-port', (event, portList, webContents, callback) => {
    event.preventDefault()
    const selectedPort = portList.find((device) => {
-      return device.vendorId === 0x2341 && device.productId === 0x0043
+      return device.vendorId === '9025' && device.productId === '67'
    })
    if (!selectedPort) {
      callback('')
    } else {
-      callback(result1.portId)
+      callback(selectedPort.portId)
    }
  })
 })
@@ -492,6 +492,7 @@ win.webContents.session.setCertificateVerifyProc((request, callback) => {
  * `permission` String - The type of requested permission.
    * `clipboard-read` - Request access to read from the clipboard.
    * `media` -  Request access to media devices such as camera, microphone and speakers.
+    * `display-capture` - Request access to capture the screen.
    * `mediaKeySystem` - Request access to DRM protected content.
    * `geolocation` - Request access to user's current location.
    * `notifications` - Request notification creation and the ability to display them in the user's system tray.
@@ -500,6 +501,7 @@ win.webContents.session.setCertificateVerifyProc((request, callback) => {
    * `pointerLock` - Request to directly interpret mouse movements as an input method. Click [here](https://developer.mozilla.org/en-US/docs/Web/API/Pointer_Lock_API) to know more.
    * `fullscreen` - Request for the app to enter fullscreen mode.
    * `openExternal` - Request to open links in external applications.
+    * `unknown` - An unrecognized permission request
  * `callback` Function
    * `permissionGranted` Boolean - Allow or deny the permission.
  * `details` Object - Some properties are only available on certain permission types.
@@ -511,7 +513,9 @@ win.webContents.session.setCertificateVerifyProc((request, callback) => {

 Sets the handler which can be used to respond to permission requests for the `session`.
 Calling `callback(true)` will allow the permission and `callback(false)` will reject it.
-To clear the handler, call `setPermissionRequestHandler(null)`.
+To clear the handler, call `setPermissionRequestHandler(null)`.  Please note that
+you must also implement `setPermissionCheckHandler` to get complete permission handling.
+Most web APIs do a permission check and then make a permission request if the check is denied.

 ```javascript
 const { session } = require('electron')
@@ -527,28 +531,32 @@ session.fromPartition('some-partition').setPermissionRequestHandler((webContents
 #### `ses.setPermissionCheckHandler(handler)`

 * `handler` Function\<Boolean> | null
-  * `webContents` [WebContents](web-contents.md) - WebContents checking the permission.  Please note that if the request comes from a subframe you should use `requestingUrl` to check the request origin.
+  * `webContents` ([WebContents](web-contents.md) | null) - WebContents checking the permission.  Please note that if the request comes from a subframe you should use `requestingUrl` to check the request origin.  Cross origin sub frames making permission checks will pass a `null` webContents to this handler.  You should use `embeddingOrigin` and `requestingOrigin` to determine what origin the owning frame and the requesting frame are on respectively.
  * `permission` String - Type of permission check.  Valid values are `midiSysex`, `notifications`, `geolocation`, `media`,`mediaKeySystem`,`midi`, `pointerLock`, `fullscreen`, `openExternal`, or `serial`.
  * `requestingOrigin` String - The origin URL of the permission check
  * `details` Object - Some properties are only available on certain permission types.
-    * `securityOrigin` String - The security origin of the `media` check.
-    * `mediaType` String - The type of media access being requested, can be `video`,
+    * `embeddingOrigin` String (optional) - The origin of the frame embedding the frame that made the permission check.  Only set for cross-origin sub frames making permission checks.
+    * `securityOrigin` String (optional) - The security origin of the `media` check.
+    * `mediaType` String (optional) - The type of media access being requested, can be `video`,
      `audio` or `unknown`
-    * `requestingUrl` String - The last URL the requesting frame loaded
+    * `requestingUrl` String (optional) - The last URL the requesting frame loaded.  This is not provided for cross-origin sub frames making permission checks.
    * `isMainFrame` Boolean - Whether the frame making the request is the main frame

 Sets the handler which can be used to respond to permission checks for the `session`.
-Returning `true` will allow the permission and `false` will reject it.
+Returning `true` will allow the permission and `false` will reject it.  Please note that
+you must also implement `setPermissionRequestHandler` to get complete permission handling.
+Most web APIs do a permission check and then make a permission request if the check is denied.
 To clear the handler, call `setPermissionCheckHandler(null)`.

 ```javascript
 const { session } = require('electron')
-session.fromPartition('some-partition').setPermissionCheckHandler((webContents, permission) => {
-  if (webContents.getURL() === 'some-host' && permission === 'notifications') {
-    return false // denied
+const url = require('url')
+session.fromPartition('some-partition').setPermissionCheckHandler((webContents, permission, requestingOrigin) => {
+  if (new URL(requestingOrigin).hostname === 'some-host' && permission === 'notifications') {
+    return true // granted
  }

-  return true
+  return false // denied
 })
 ```

@@ -742,9 +750,13 @@ will not work on non-persistent (in-memory) sessions.

 **Note:** On macOS and Windows 10 this word will be removed from the OS custom dictionary as well

-#### `ses.loadExtension(path)`
+#### `ses.loadExtension(path[, options])`

 * `path` String - Path to a directory containing an unpacked Chrome extension
+* `options` Object (optional)
+  * `allowFileAccess` Boolean - Whether to allow the extension to read local files over `file://`
+    protocol and inject content scripts into `file://` pages. This is required e.g. for loading
+    devtools extensions on `file://` URLs. Defaults to false.

 Returns `Promise<Extension>` - resolves when the extension is loaded.

@@ -767,7 +779,11 @@ const { app, session } = require('electron')
 const path = require('path')

 app.on('ready', async () => {
-  await session.defaultSession.loadExtension(path.join(__dirname, 'react-devtools'))
+  await session.defaultSession.loadExtension(
+    path.join(__dirname, 'react-devtools'),
+    // allowFileAccess is required to load the devtools extension on file:// URLs.
+    { allowFileAccess: true }
+  )
  // Note that in order to use the React DevTools extension, you'll need to
  // download and unzip a copy of the extension.
 })
@@ -806,6 +822,11 @@ Returns `Extension[]` - A list of all loaded extensions.
 **Note:** This API cannot be called before the `ready` event of the `app` module
 is emitted.

+#### `ses.getStoragePath()`
+
+A `String | null` indicating the absolute file system path where data for this
+session is persisted on disk.  For in memory sessions this returns `null`.
+
 ### Instance Properties

 The following properties are available on instances of `Session`:
@@ -819,6 +840,11 @@ code to the `setSpellCheckerLanguages` API that isn't in this array will result

 A `Boolean` indicating whether builtin spell checker is enabled.

+#### `ses.storagePath` _Readonly_
+
+A `String | null` indicating the absolute file system path where data for this
+session is persisted on disk.  For in memory sessions this returns `null`.
+
 #### `ses.cookies` _Readonly_

 A [`Cookies`](cookies.md) object for this session.
--- a/docs/api/share-menu.md
+++ b/docs/api/share-menu.md
@@ -1,8 +1,4 @@
-## Class: ShareMenu
-
-> Create share menu on macOS.
-
-Process: [Main](../glossary.md#main-process)
+# ShareMenu

 The `ShareMenu` class creates [Share Menu][share-menu] on macOS, which can be
 used to share information from the current context to apps, social media
@@ -11,6 +7,12 @@ accounts, and other services.
 For including the share menu as a submenu of other menus, please use the
 `shareMenu` role of [`MenuItem`](menu-item.md).

+## Class: ShareMenu
+
+> Create share menu on macOS.
+
+Process: [Main](../glossary.md#main-process)
+
 ### `new ShareMenu(sharingItem)`

 * `sharingItem` SharingItem - The item to share.
--- a/docs/api/shell.md
+++ b/docs/api/shell.md
@@ -45,17 +45,6 @@ Returns `Promise<void>`

 Open the given external protocol URL in the desktop's default manner. (For example, mailto: URLs in the user's default mail agent).

-### `shell.moveItemToTrash(fullPath[, deleteOnFail])` _Deprecated_
-
-* `fullPath` String
-* `deleteOnFail` Boolean (optional) - Whether or not to unilaterally remove the item if the Trash is disabled or unsupported on the volume. _macOS_
-
-Returns `Boolean` - Whether the item was successfully moved to the trash or otherwise deleted.
-
-> NOTE: This method is deprecated. Use `shell.trashItem` instead.
-
-Move the given file to trash and returns a boolean status for the operation.
-
 ### `shell.trashItem(path)`

 * `path` String - path to the item to be moved to the trash.
--- a/docs/api/structures/desktop-capturer-source.md
+++ b/docs/api/structures/desktop-capturer-source.md
@@ -3,7 +3,10 @@
 * `id` String - The identifier of a window or screen that can be used as a
  `chromeMediaSourceId` constraint when calling
  [`navigator.webkitGetUserMedia`]. The format of the identifier will be
-  `window:XX` or `screen:XX`, where `XX` is a random generated number.
+  `window:XX:YY` or `screen:ZZ:0`. XX is the windowID/handle. YY is 1 for
+  the current process, and 0 for all others. ZZ is a sequential number
+  that represents the screen, and it does not equal to the index in the
+  source's name.
 * `name` String - A screen source will be named either `Entire Screen` or
  `Screen <index>`, while the name of a window source will match the window
  title.
--- a/docs/api/structures/display.md
+++ b/docs/api/structures/display.md
@@ -11,9 +11,9 @@
 * `colorDepth` Number - The number of bits per pixel.
 * `depthPerComponent` Number - The number of bits per color component.
 * `displayFrequency` Number - The display refresh rate.
-* `bounds` [Rectangle](rectangle.md)
+* `bounds` [Rectangle](rectangle.md) - the bounds of the display in DIP points.
 * `size` [Size](size.md)
-* `workArea` [Rectangle](rectangle.md)
+* `workArea` [Rectangle](rectangle.md) - the work area of the display in DIP points.
 * `workAreaSize` [Size](size.md)
 * `internal` Boolean - `true` for an internal display and `false` for an external display

--- a/docs/api/structures/ipc-main-event.md
+++ b/docs/api/structures/ipc-main-event.md
@@ -1,8 +1,10 @@
 # IpcMainEvent Object extends `Event`

+* `processId` Integer - The internal ID of the renderer process that sent this message
 * `frameId` Integer - The ID of the renderer frame that sent this message
 * `returnValue` any - Set this to the value to be returned in a synchronous message
 * `sender` WebContents - Returns the `webContents` that sent the message
+* `senderFrame` WebFrameMain _Readonly_ - The frame that sent this message
 * `ports` MessagePortMain[] - A list of MessagePorts that were transferred with this message
 * `reply` Function - A function that will send an IPC message to the renderer frame that sent the original message that you are currently handling.  You should use this method to "reply" to the sent message in order to guarantee the reply will go to the correct process and frame.
  * `channel` String
--- a/docs/api/structures/ipc-main-invoke-event.md
+++ b/docs/api/structures/ipc-main-invoke-event.md
@@ -1,4 +1,6 @@
 # IpcMainInvokeEvent Object extends `Event`

+* `processId` Integer - The internal ID of the renderer process that sent this message
 * `frameId` Integer - The ID of the renderer frame that sent this message
 * `sender` WebContents - Returns the `webContents` that sent the message
+* `senderFrame` WebFrameMain _Readonly_ - The frame that sent this message
--- a/docs/api/structures/jump-list-category.md
+++ b/docs/api/structures/jump-list-category.md
@@ -19,3 +19,7 @@
 property set then its `type` is assumed to be `tasks`. If the `name` property
 is set but the `type` property is omitted then the `type` is assumed to be
 `custom`.
+
+**Note:** The maximum length of a Jump List item's `description` property is
+260 characters. Beyond this limit, the item will not be added to the Jump
+List, nor will it be displayed.
--- a/docs/api/structures/jump-list-item.md
+++ b/docs/api/structures/jump-list-item.md
@@ -17,7 +17,7 @@
 * `title` String (optional) - The text to be displayed for the item in the Jump List.
  Should only be set if `type` is `task`.
 * `description` String (optional) - Description of the task (displayed in a tooltip).
-  Should only be set if `type` is `task`.
+  Should only be set if `type` is `task`. Maximum length 260 characters.
 * `iconPath` String (optional) - The absolute path to an icon to be displayed in a
  Jump List, which can be an arbitrary resource file that contains an icon
  (e.g. `.ico`, `.exe`, `.dll`). You can usually specify `process.execPath` to
--- a/docs/api/structures/post-body.md
+++ b/docs/api/structures/post-body.md
@@ -1,6 +1,6 @@
 # PostBody Object

-* `data` Array<[PostData](./post-data.md)> - The post data to be sent to the
+* `data` ([UploadRawData](upload-raw-data.md) | [UploadFile](upload-file.md))[] - The post data to be sent to the
  new window.
 * `contentType` String - The `content-type` header used for the data. One of
  `application/x-www-form-urlencoded` or `multipart/form-data`. Corresponds to
--- a/docs/api/structures/post-data.md
+++ b/docs/api/structures/post-data.md
@@ -1,21 +0,0 @@
-# PostData Object
-
-* `type` String - One of the following:
-  * `rawData` - The data is available as a `Buffer`, in the `rawData` field.
-  * `file` - The object represents a file. The `filePath`, `offset`, `length`
-    and `modificationTime` fields will be used to describe the file.
-  * `blob` - The object represents a `Blob`. The `blobUUID` field will be used
-    to describe the `Blob`.
-* `bytes` String (optional) - The raw bytes of the post data in a `Buffer`.
-  Required for the `rawData` type.
-* `filePath` String (optional) - The path of the file being uploaded. Required
-  for the `file` type.
-* `blobUUID` String (optional) - The `UUID` of the `Blob` being uploaded.
-  Required for the `blob` type.
-* `offset` Integer (optional) - The offset from the beginning of the file being
-  uploaded, in bytes. Only valid for `file` types.
-* `length` Integer (optional) - The length of the file being uploaded, in bytes.
-  If set to `-1`, the whole file will be uploaded. Only valid for `file` types.
-* `modificationTime` Double (optional) - The modification time of the file
-  represented by a double, which is the number of seconds since the `UNIX Epoch`
-  (Jan 1, 1970). Only valid for `file` types.
--- a/docs/api/structures/upload-file.md
+++ b/docs/api/structures/upload-file.md
@@ -1,6 +1,6 @@
 # UploadFile Object

-* `type` String - `file`.
+* `type` 'file' - `file`.
 * `filePath` String - Path of file to be uploaded.
 * `offset` Integer - Defaults to `0`.
 * `length` Integer - Number of bytes to read from `offset`.
--- a/docs/api/structures/upload-raw-data.md
+++ b/docs/api/structures/upload-raw-data.md
@@ -1,4 +1,4 @@
 # UploadRawData Object

-* `type` String - `rawData`.
+* `type` 'rawData' - `rawData`.
 * `bytes` Buffer - Data to be uploaded.
--- a/docs/api/synopsis.md
+++ b/docs/api/synopsis.md
@@ -13,7 +13,7 @@ either process type.

 The basic rule is: if a module is [GUI][gui] or low-level system related, then
 it should be only available in the main process. You need to be familiar with
-the concept of [main process vs. renderer process](../tutorial/quick-start.md#main-and-renderer-processes)
+the concept of main process vs. renderer process
 scripts to be able to use those modules.

 The main process script is like a normal Node.js script:
@@ -43,8 +43,6 @@ extra ability to use node modules if `nodeIntegration` is enabled:
 </html>
 ```

-To run your app, read [Run your app](../tutorial/quick-start.md#run-your-application).
-
 ## Destructuring assignment

 As of 0.37, you can use
--- a/docs/api/system-preferences.md
+++ b/docs/api/system-preferences.md
@@ -130,6 +130,8 @@ This is necessary for events such as `NSUserDefaultsDidChangeNotification`.
  * `userInfo` Record<String, unknown>
  * `object` String

+Returns `Number` - The ID of this subscription
+
 Same as `subscribeNotification`, but uses `NSWorkspace.sharedWorkspace.notificationCenter`.
 This is necessary for events such as `NSWorkspaceDidActivateApplicationNotification`.

@@ -433,7 +435,7 @@ It will always return `granted` for `screen` and for all media types on older ve

 Returns `Promise<Boolean>` - A promise that resolves with `true` if consent was granted and `false` if it was denied. If an invalid `mediaType` is passed, the promise will be rejected. If an access request was denied and later is changed through the System Preferences pane, a restart of the app will be required for the new permissions to take effect. If access has already been requested and denied, it _must_ be changed through the preference pane; an alert will not pop up and the promise will resolve with the existing access status.

-**Important:** In order to properly leverage this API, you [must set](https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/requesting_authorization_for_media_capture_on_macos?language=objc) the `NSMicrophoneUsageDescription` and `NSCameraUsageDescription` strings in your app's `Info.plist` file. The values for these keys will be used to populate the permission dialogs so that the user will be properly informed as to the purpose of the permission request. See [Electron Application Distribution](https://electronjs.org/docs/tutorial/application-distribution#macos) for more information about how to set these in the context of Electron.
+**Important:** In order to properly leverage this API, you [must set](https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/requesting_authorization_for_media_capture_on_macos?language=objc) the `NSMicrophoneUsageDescription` and `NSCameraUsageDescription` strings in your app's `Info.plist` file. The values for these keys will be used to populate the permission dialogs so that the user will be properly informed as to the purpose of the permission request. See [Electron Application Distribution](../tutorial/application-distribution.md#macos) for more information about how to set these in the context of Electron.

 This user consent was not required until macOS 10.14 Mojave, so this method will always return `true` if your system is running 10.13 High Sierra or lower.

--- a/docs/api/touch-bar.md
+++ b/docs/api/touch-bar.md
@@ -1,3 +1,5 @@
+# TouchBar
+
 ## Class: TouchBar

 > Create TouchBar layouts for native macOS applications
--- a/docs/api/tray.md
+++ b/docs/api/tray.md
@@ -1,3 +1,5 @@
+# Tray
+
 ## Class: Tray

 > Add icons and context menus to the system's notification area.
--- a/docs/api/web-contents.md
+++ b/docs/api/web-contents.md
@@ -42,7 +42,8 @@ returns `null`.

 * `id` Integer

-Returns `WebContents` - A WebContents instance with the given ID.
+Returns `WebContents` | undefined - A WebContents instance with the given ID, or
+`undefined` if there is no WebContents associated with the given ID.

 ## Class: WebContents

@@ -155,7 +156,7 @@ Returns:
  be set. If no post data is to be sent, the value will be `null`. Only defined
  when the window is being created by a form that set `target=_blank`.

-Deprecated in favor of [`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandler-handler).
+Deprecated in favor of [`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandlerhandler).

 Emitted when the page requests to open a new window for a `url`. It could be
 requested by `window.open` or an external link like `<a target='_blank'>`.
@@ -194,33 +195,34 @@ myBrowserWindow.webContents.on('new-window', (event, url, frameName, disposition
 #### Event: 'did-create-window'

 Returns:
+
 * `window` BrowserWindow
 * `details` Object
-    * `url` String - URL for the created window.
-    * `frameName` String - Name given to the created window in the
-      `window.open()` call.
-    * `options` BrowserWindowConstructorOptions - The options used to create the
-      BrowserWindow. They are merged in increasing precedence: options inherited
-      from the parent, parsed options from the `features` string from
-      `window.open()`, and options given by
-      [`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandler-handler).
-      Unrecognized options are not filtered out.
-    * `additionalFeatures` String[] - The non-standard features (features not
-      handled Chromium or Electron) _Deprecated_
-    * `referrer` [Referrer](structures/referrer.md) - The referrer that will be
-      passed to the new window. May or may not result in the `Referer` header
-      being sent, depending on the referrer policy.
-    * `postBody` [PostBody](structures/post-body.md) (optional) - The post data
-      that will be sent to the new window, along with the appropriate headers
-      that will be set. If no post data is to be sent, the value will be `null`.
-      Only defined when the window is being created by a form that set
-      `target=_blank`.
-    * `disposition` String - Can be `default`, `foreground-tab`,
-      `background-tab`, `new-window`, `save-to-disk` and `other`.
+  * `url` String - URL for the created window.
+  * `frameName` String - Name given to the created window in the
+     `window.open()` call.
+  * `options` BrowserWindowConstructorOptions - The options used to create the
+    BrowserWindow. They are merged in increasing precedence: options inherited
+    from the parent, parsed options from the `features` string from
+    `window.open()`, and options given by
+    [`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandlerhandler).
+    Unrecognized options are not filtered out.
+  * `additionalFeatures` String[] - The non-standard features (features not
+    handled Chromium or Electron) _Deprecated_
+  * `referrer` [Referrer](structures/referrer.md) - The referrer that will be
+    passed to the new window. May or may not result in the `Referer` header
+    being sent, depending on the referrer policy.
+  * `postBody` [PostBody](structures/post-body.md) (optional) - The post data
+    that will be sent to the new window, along with the appropriate headers
+    that will be set. If no post data is to be sent, the value will be `null`.
+    Only defined when the window is being created by a form that set
+    `target=_blank`.
+  * `disposition` String - Can be `default`, `foreground-tab`,
+    `background-tab`, `new-window`, `save-to-disk` and `other`.

 Emitted _after_ successful creation of a window via `window.open` in the renderer.
 Not emitted if the creation of the window is canceled from
-[`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandler-handler).
+[`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandlerhandler).

 See [`window.open()`](window-open.md) for more details and how to use this in conjunction with `webContents.setWindowOpenHandler`.

@@ -401,6 +403,9 @@ Returns:
    * `oom` - Process ran out of memory
    * `launch-failed` - Process never successfully launched
    * `integrity-failure` - Windows code integrity checks failed
+  * `exitCode` Integer - The exit code of the process, unless `reason` is
+    `launch-failed`, in which case `exitCode` will be a platform-specific
+    launch failure error code.

 Emitted when the renderer process unexpectedly disappears.  This is normally
 because it was crashed or killed.
@@ -638,8 +643,15 @@ Returns:
  * `isEditable` Boolean - Whether the context is editable.
  * `selectionText` String - Text of the selection that the context menu was
    invoked on.
-  * `titleText` String - Title or alt text of the selection that the context
-    was invoked on.
+  * `titleText` String - Title text of the selection that the context menu was
+    invoked on.
+  * `altText` String - Alt text of the selection that the context menu was
+    invoked on.
+  * `suggestedFilename` String - Suggested filename to be used when saving file through 'Save
+    Link As' option of context menu.
+  * `selectionRect` [Rectangle](structures/rectangle.md) - Rect representing the coordinates in the document space of the selection.
+  * `selectionStartOffset` Number - Start position of the selection text.
+  * `referrerPolicy` [Referrer](structures/referrer.md) - The referrer policy of the frame on which the menu is invoked.
  * `misspelledWord` String - The misspelled word under the cursor, if any.
  * `dictionarySuggestions` String[] - An array of suggested words to show the
    user to replace the `misspelledWord`.  Only available if there is a misspelled
@@ -649,8 +661,9 @@ Returns:
  * `inputFieldType` String - If the context menu was invoked on an input
    field, the type of that field. Possible values are `none`, `plainText`,
    `password`, `other`.
+  * `spellcheckEnabled` Boolean - If the context is editable, whether or not spellchecking is enabled.
  * `menuSourceType` String - Input source that invoked the context menu.
-    Can be `none`, `mouse`, `keyboard`, `touch` or `touchMenu`.
+    Can be `none`, `mouse`, `keyboard`, `touch`, `touchMenu`, `longPress`, `longTap`, `touchHandle`, `stylus`, `adjustSelection`, or `adjustSelectionReset`.
  * `mediaFlags` Object - The flags for the media element the context menu was
    invoked on.
    * `inError` Boolean - Whether the media element has crashed.
@@ -662,16 +675,22 @@ Returns:
      visible.
    * `canToggleControls` Boolean - Whether the media element's controls are
      toggleable.
+    * `canPrint` Boolean - Whether the media element can be printed.
+    * `canSave` Boolean - Whether or not the media element can be downloaded.
+    * `canShowPictureInPicture` Boolean - Whether the media element can show picture-in-picture.
+    * `isShowingPictureInPicture` Boolean - Whether the media element is currently showing picture-in-picture.
    * `canRotate` Boolean - Whether the media element can be rotated.
+    * `canLoop` Boolean - Whether the media element can be looped.
  * `editFlags` Object - These flags indicate whether the renderer believes it
    is able to perform the corresponding action.
    * `canUndo` Boolean - Whether the renderer believes it can undo.
    * `canRedo` Boolean - Whether the renderer believes it can redo.
    * `canCut` Boolean - Whether the renderer believes it can cut.
-    * `canCopy` Boolean - Whether the renderer believes it can copy
+    * `canCopy` Boolean - Whether the renderer believes it can copy.
    * `canPaste` Boolean - Whether the renderer believes it can paste.
    * `canDelete` Boolean - Whether the renderer believes it can delete.
    * `canSelectAll` Boolean - Whether the renderer believes it can select all.
+    * `canEditRichly` Boolean - Whether the renderer believes it can edit text richly.

 Emitted when there is a new context menu that needs to be handled.

@@ -895,7 +914,7 @@ in `webPreferences`.
  * `httpReferrer` (String | [Referrer](structures/referrer.md)) (optional) - An HTTP Referrer url.
  * `userAgent` String (optional) - A user agent originating the request.
  * `extraHeaders` String (optional) - Extra headers separated by "\n".
-  * `postData` ([UploadRawData[]](structures/upload-raw-data.md) | [UploadFile[]](structures/upload-file.md)) (optional)
+  * `postData` ([UploadRawData](structures/upload-raw-data.md) | [UploadFile](structures/upload-file.md))[] (optional)
  * `baseURLForDataURL` String (optional) - Base url (with trailing path separator) for files to be loaded by the data url. This is needed only if the specified `url` is a data url and needs to load other files.

 Returns `Promise<void>` - the promise will resolve when the page has finished loading
@@ -1165,6 +1184,16 @@ Ignore application menu shortcuts while this web contents is focused.
    * `url` String - The _resolved_ version of the URL passed to `window.open()`. e.g. opening a window with `window.open('foo')` will yield something like `https://the-origin/the/current/path/foo`.
    * `frameName` String - Name of the window provided in `window.open()`
    * `features` String - Comma separated list of window features provided to `window.open()`.
+    * `disposition` String - Can be `default`, `foreground-tab`, `background-tab`,
+      `new-window`, `save-to-disk` or `other`.
+    * `referrer` [Referrer](structures/referrer.md) - The referrer that will be
+      passed to the new window. May or may not result in the `Referer` header being
+      sent, depending on the referrer policy.
+    * `postBody` [PostBody](structures/post-body.md) (optional) - The post data that
+      will be sent to the new window, along with the appropriate headers that will
+      be set. If no post data is to be sent, the value will be `null`. Only defined
+      when the window is being created by a form that set `target=_blank`.
+
  Returns `{action: 'deny'} | {action: 'allow', overrideBrowserWindowOptions?: BrowserWindowConstructorOptions}` - `deny` cancels the creation of the new
  window. `allow` will allow the new window to be created. Specifying `overrideBrowserWindowOptions` allows customization of the created window.
  Returning an unrecognized value such as a null, undefined, or an object
@@ -1301,8 +1330,7 @@ Inserts `text` to the focused element.
 * `text` String - Content to be searched, must not be empty.
 * `options` Object (optional)
  * `forward` Boolean (optional) - Whether to search forward or backward, defaults to `true`.
-  * `findNext` Boolean (optional) - Whether the operation is first request or a follow up,
-    defaults to `false`.
+  * `findNext` Boolean (optional) - Whether to begin a new text finding session with this request. Should be `true` for initial requests, and `false` for follow-up requests. Defaults to `false`.
  * `matchCase` Boolean (optional) - Whether search should be case-sensitive,
    defaults to `false`.

@@ -1344,19 +1372,21 @@ Captures a snapshot of the page within `rect`. Omitting `rect` will capture the
 Returns `Boolean` - Whether this page is being captured. It returns true when the capturer count
 is large then 0.

-#### `contents.incrementCapturerCount([size, stayHidden])`
+#### `contents.incrementCapturerCount([size, stayHidden, stayAwake])`

 * `size` [Size](structures/size.md) (optional) - The preferred size for the capturer.
 * `stayHidden` Boolean (optional) -  Keep the page hidden instead of visible.
+* `stayAwake` Boolean (optional) -  Keep the system awake instead of allowing it to sleep.

 Increase the capturer count by one. The page is considered visible when its browser window is
 hidden and the capturer count is non-zero. If you would like the page to stay hidden, you should ensure that `stayHidden` is set to true.

 This also affects the Page Visibility API.

-#### `contents.decrementCapturerCount([stayHidden])`
+#### `contents.decrementCapturerCount([stayHidden, stayAwake])`

 * `stayHidden` Boolean (optional) -  Keep the page in hidden state instead of visible.
+* `stayAwake` Boolean (optional) -  Keep the system awake instead of allowing it to sleep.

 Decrease the capturer count by one. The page will be set to hidden or occluded state when its
 browser window is hidden or occluded and the capturer count reaches zero. If you want to
@@ -1463,7 +1493,7 @@ By default, an empty `options` will be regarded as:
 }
 ```

-Use `page-break-before: always; ` CSS style to force to print to a new page.
+Use `page-break-before: always;` CSS style to force to print to a new page.

 An example of `webContents.printToPDF`:

@@ -1657,8 +1687,7 @@ included. Sending Functions, Promises, Symbols, WeakMaps, or WeakSets will
 throw an exception.

 > **NOTE**: Sending non-standard JavaScript types such as DOM objects or
-> special Electron objects is deprecated, and will begin throwing an exception
-> starting with Electron 9.
+> special Electron objects will throw an exception.

 The renderer process can handle the message by listening to `channel` with the
 [`ipcRenderer`](ipc-renderer.md) module.
@@ -1694,7 +1723,9 @@ app.whenReady().then(() => {

 #### `contents.sendToFrame(frameId, channel, ...args)`

-* `frameId` Integer
+* `frameId` Integer | [number, number] - the ID of the frame to send to, or a
+  pair of `[processId, frameId]` if the frame is in a different process to the
+  main frame.
 * `channel` String
 * `...args` any[]

@@ -1704,9 +1735,8 @@ Send an asynchronous message to a specific frame in a renderer process via
 chains will not be included. Sending Functions, Promises, Symbols, WeakMaps, or
 WeakSets will throw an exception.

-> **NOTE**: Sending non-standard JavaScript types such as DOM objects or
-> special Electron objects is deprecated, and will begin throwing an exception
-> starting with Electron 9.
+> **NOTE:** Sending non-standard JavaScript types such as DOM objects or
+> special Electron objects will throw an exception.

 The renderer process can handle the message by listening to `channel` with the
 [`ipcRenderer`](ipc-renderer.md) module.
@@ -1869,7 +1899,7 @@ Returns `Boolean` - If *offscreen rendering* is enabled returns whether it is cu
 * `fps` Integer

 If *offscreen rendering* is enabled sets the frame rate to the specified number.
-Only values between 1 and 60 are accepted.
+Only values between 1 and 240 are accepted.

 #### `contents.getFrameRate()`

@@ -1967,7 +1997,7 @@ The zoom factor is the zoom percent divided by 100, so 300% = 3.0.
 #### `contents.frameRate`

 An `Integer` property that sets the frame rate of the web contents to the specified number.
-Only values between 1 and 60 are accepted.
+Only values between 1 and 240 are accepted.

 Only applicable if *offscreen rendering* is enabled.

--- a/docs/api/web-frame-main.md
+++ b/docs/api/web-frame-main.md
@@ -26,7 +26,7 @@ win.webContents.on(
 )
 ```

-You can also access frames of existing pages by using the `webFrame` property
+You can also access frames of existing pages by using the `mainFrame` property
 of [`WebContents`](web-contents.md).

 ```javascript
@@ -57,13 +57,14 @@ These methods can be accessed from the `webFrameMain` module:

 ### `webFrameMain.fromId(processId, routingId)`

-* `processId` Integer - An `Integer` representing the id of the process which owns the frame.
-* `routingId` Integer - An `Integer` representing the unique frame id in the
+* `processId` Integer - An `Integer` representing the internal ID of the process which owns the frame.
+* `routingId` Integer - An `Integer` representing the unique frame ID in the
  current renderer process. Routing IDs can be retrieved from `WebFrameMain`
  instances (`frame.routingId`) and are also passed by frame
  specific `WebContents` navigation events (e.g. `did-frame-navigate`).

-Returns `WebFrameMain` - A frame with the given process and routing IDs.
+Returns `WebFrameMain | undefined` - A frame with the given process and routing IDs,
+or `undefined` if there is no WebFrameMain associated with the given IDs.

 ## Class: WebFrameMain

@@ -89,6 +90,47 @@ this limitation.

 Returns `boolean` - Whether the reload was initiated successfully. Only results in `false` when the frame has no history.

+#### `frame.send(channel, ...args)`
+
+* `channel` String
+* `...args` any[]
+
+Send an asynchronous message to the renderer process via `channel`, along with
+arguments. Arguments will be serialized with the [Structured Clone
+Algorithm][SCA], just like [`postMessage`][], so prototype chains will not be
+included. Sending Functions, Promises, Symbols, WeakMaps, or WeakSets will
+throw an exception.
+
+The renderer process can handle the message by listening to `channel` with the
+[`ipcRenderer`](ipc-renderer.md) module.
+
+#### `frame.postMessage(channel, message, [transfer])`
+
+* `channel` String
+* `message` any
+* `transfer` MessagePortMain[] (optional)
+
+Send a message to the renderer process, optionally transferring ownership of
+zero or more [`MessagePortMain`][] objects.
+
+The transferred `MessagePortMain` objects will be available in the renderer
+process by accessing the `ports` property of the emitted event. When they
+arrive in the renderer, they will be native DOM `MessagePort` objects.
+
+For example:
+
+```js
+// Main process
+const { port1, port2 } = new MessageChannelMain()
+webContents.mainFrame.postMessage('port', { message: 'hello' }, [port1])
+
+// Renderer process
+ipcRenderer.on('port', (e, msg) => {
+  const [port] = e.ports
+  // ...
+})
+```
+
 ### Instance Properties

 #### `frame.url` _Readonly_
--- a/docs/api/web-frame.md
+++ b/docs/api/web-frame.md
@@ -62,6 +62,11 @@ Sets the maximum and minimum pinch-to-zoom level.
 > webFrame.setVisualZoomLevelLimits(1, 3)
 > ```

+> **NOTE**: Visual zoom only applies to pinch-to-zoom behavior. Cmd+/-/0 zoom shortcuts are
+> controlled by the 'zoomIn', 'zoomOut', and 'resetZoom' MenuItem roles in the application
+> Menu. To disable shortcuts, manually [define the Menu](./menu.md#examples) and omit zoom roles
+> from the definition.
+
 ### `webFrame.setSpellCheckProvider(language, provider)`

 * `language` String
--- a/docs/api/web-request.md
+++ b/docs/api/web-request.md
@@ -51,6 +51,8 @@ The following methods are available on instances of `WebRequest`:
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
@@ -94,6 +96,8 @@ Some examples of valid `urls`:
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
@@ -121,6 +125,8 @@ The `callback` has to be called with a `response` object.
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
@@ -141,12 +147,13 @@ response are visible by the time this listener is fired.
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
    * `statusLine` String
    * `statusCode` Integer
-    * `requestHeaders` Record<string, string>
    * `responseHeaders` Record<string, string[]> (optional)
  * `callback` Function
    * `headersReceivedResponse` Object
@@ -173,6 +180,8 @@ The `callback` has to be called with a `response` object.
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
@@ -197,6 +206,8 @@ and response headers are available.
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
@@ -222,6 +233,8 @@ redirect is about to occur.
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
@@ -245,6 +258,8 @@ completed.
    * `url` String
    * `method` String
    * `webContentsId` Integer (optional)
+    * `webContents` WebContents (optional)
+    * `frame` WebFrameMain (optional)
    * `resourceType` String
    * `referrer` String
    * `timestamp` Double
--- a/docs/api/webview-tag.md
+++ b/docs/api/webview-tag.md
@@ -5,7 +5,7 @@
 Electron's `webview` tag is based on [Chromium's `webview`][chrome-webview], which
 is undergoing dramatic architectural changes. This impacts the stability of `webviews`,
 including rendering, navigation, and event routing. We currently recommend to not
-use the `webview` tag and to consider alternatives, like `iframe`, Electron's `BrowserView`,
+use the `webview` tag and to consider alternatives, like `iframe`, [Electron's `BrowserView`](browser-view.md),
 or an architecture that avoids embedded content altogether.

 ## Enabling
@@ -274,7 +274,7 @@ webview.addEventListener('dom-ready', () => {
  * `httpReferrer` (String | [Referrer](structures/referrer.md)) (optional) - An HTTP Referrer url.
  * `userAgent` String (optional) - A user agent originating the request.
  * `extraHeaders` String (optional) - Extra headers separated by "\n"
-  * `postData` ([UploadRawData[]](structures/upload-raw-data.md) | [UploadFile[]](structures/upload-file.md)) (optional)
+  * `postData` ([UploadRawData](structures/upload-raw-data.md) | [UploadFile](structures/upload-file.md))[] (optional)
  * `baseURLForDataURL` String (optional) - Base url (with trailing path separator) for files to be loaded by the data url. This is needed only if the specified `url` is a data url and needs to load other files.

 Returns `Promise<void>` - The promise will resolve when the page has finished loading
@@ -515,8 +515,7 @@ Inserts `text` to the focused element.
 * `text` String - Content to be searched, must not be empty.
 * `options` Object (optional)
  * `forward` Boolean (optional) - Whether to search forward or backward, defaults to `true`.
-  * `findNext` Boolean (optional) - Whether the operation is first request or a follow up,
-    defaults to `false`.
+  * `findNext` Boolean (optional) - Whether to begin a new text finding session with this request. Should be `true` for initial requests, and `false` for follow-up requests. Defaults to `false`.
  * `matchCase` Boolean (optional) - Whether search should be case-sensitive,
    defaults to `false`.

@@ -719,6 +718,10 @@ Corresponds to the points in time when the spinner of the tab starts spinning.

 Corresponds to the points in time when the spinner of the tab stops spinning.

+### Event: 'did-attach'
+
+Fired when attached to the embedder web contents.
+
 ### Event: 'dom-ready'

 Fired when document in the given frame is loaded.
@@ -839,6 +842,19 @@ this purpose.

 Calling `event.preventDefault()` does __NOT__ have any effect.

+### Event: 'did-start-navigation'
+
+Returns:
+
+* `url` String
+* `isInPlace` Boolean
+* `isMainFrame` Boolean
+* `frameProcessId` Integer
+* `frameRoutingId` Integer
+
+Emitted when any frame (including main) starts navigating. `isInPlace` will be
+`true` for in-page navigations.
+
 ### Event: 'did-navigate'

 Returns:
@@ -851,6 +867,23 @@ This event is not emitted for in-page navigations, such as clicking anchor links
 or updating the `window.location.hash`. Use `did-navigate-in-page` event for
 this purpose.

+### Event: 'did-frame-navigate'
+
+Returns:
+
+* `url` String
+* `httpResponseCode` Integer - -1 for non HTTP navigations
+* `httpStatusText` String - empty for non HTTP navigations,
+* `isMainFrame` Boolean
+* `frameProcessId` Integer
+* `frameRoutingId` Integer
+
+Emitted when any frame navigation is done.
+
+This event is not emitted for in-page navigations, such as clicking anchor links
+or updating the `window.location.hash`. Use `did-navigate-in-page` event for
+this purpose.
+
 ### Event: 'did-navigate-in-page'

 Returns:
@@ -966,4 +999,4 @@ Emitted when DevTools is closed.
 Emitted when DevTools is focused / opened.

 [runtime-enabled-features]: https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/runtime_enabled_features.json5?l=70
-[chrome-webview]: https://developer.chrome.com/apps/tags/webview
+[chrome-webview]: https://developer.chrome.com/docs/extensions/reference/webviewTag/
--- a/docs/api/window-open.md
+++ b/docs/api/window-open.md
@@ -3,8 +3,8 @@
 There are several ways to control how windows are created from trusted or
 untrusted content within a renderer. Windows can be created from the renderer in two ways:

- clicking on links or submitting forms adorned with `target=_blank`
- JavaScript calling `window.open()`
+* clicking on links or submitting forms adorned with `target=_blank`
+* JavaScript calling `window.open()`

 In non-sandboxed renderers, or when `nativeWindowOpen` is false (the default), this results in the creation of a
 [`BrowserWindowProxy`](browser-window-proxy.md), a light wrapper around
@@ -26,7 +26,7 @@ BrowserWindow constructor options are set by, in increasing precedence
 order: options inherited from the parent, parsed options
 from the `features` string from `window.open()`, security-related webPreferences
 inherited from the parent, and options given by
-[`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandler-handler).
+[`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandlerhandler).
 Note that `webContents.setWindowOpenHandler` has final say and full privilege
 because it is invoked in the main process.

@@ -83,9 +83,9 @@ const mainWindow = new BrowserWindow()

 mainWindow.webContents.setWindowOpenHandler(({ url }) => {
  if (url.startsWith('https://github.com/')) {
-    return true
+    return { action: 'allow' }
  }
-  return false
+  return { action: 'deny' }
 })

 mainWindow.webContents.on('did-create-window', (childWindow) => {
@@ -117,15 +117,18 @@ const mainWindow = new BrowserWindow({
 mainWindow.webContents.setWindowOpenHandler(({ url }) => {
  if (url === 'about:blank') {
    return {
-      frame: false,
-      fullscreenable: false,
-      backgroundColor: 'black',
-      webPreferences: {
-        preload: 'my-child-window-preload-script.js'
+      action: 'allow',
+      overrideBrowserWindowOptions: {
+        frame: false,
+        fullscreenable: false,
+        backgroundColor: 'black',
+        webPreferences: {
+          preload: 'my-child-window-preload-script.js'
+        }
      }
    }
  }
-  return false
+  return { action: 'deny' }
 })
 ```

--- a/docs/breaking-changes.md
+++ b/docs/breaking-changes.md
@@ -6,14 +6,52 @@ Breaking changes will be documented here, and deprecation warnings added to JS c

 This document uses the following convention to categorize breaking changes:

- **API Changed:** An API was changed in such a way that code that has not been updated is guaranteed to throw an exception.
- **Behavior Changed:** The behavior of Electron has changed, but not in such a way that an exception will necessarily be thrown.
- **Default Changed:** Code depending on the old default may break, not necessarily throwing an exception. The old behavior can be restored by explicitly specifying the value.
- **Deprecated:** An API was marked as deprecated. The API will continue to function, but will emit a deprecation warning, and will be removed in a future release.
- **Removed:** An API or feature was removed, and is no longer supported by Electron.
+* **API Changed:** An API was changed in such a way that code that has not been updated is guaranteed to throw an exception.
+* **Behavior Changed:** The behavior of Electron has changed, but not in such a way that an exception will necessarily be thrown.
+* **Default Changed:** Code depending on the old default may break, not necessarily throwing an exception. The old behavior can be restored by explicitly specifying the value.
+* **Deprecated:** An API was marked as deprecated. The API will continue to function, but will emit a deprecation warning, and will be removed in a future release.
+* **Removed:** An API or feature was removed, and is no longer supported by Electron.
+
+## Planned Breaking API Changes (14.0)
+
+### API Changed: `window.(open)`
+
+The optional parameter `frameName` will no longer set the title of the window. This now follows the specification described by the [native documentation](https://developer.mozilla.org/en-US/docs/Web/API/Window/open#parameters) under the corresponding parameter `windowName`.
+
+If you were using this parameter to set the title of a window, you can instead use [win.setTitle(title)](https://www.electronjs.org/docs/api/browser-window#winsettitletitle).
+
+### Removed: `worldSafeExecuteJavaScript`
+
+In Electron 14, `worldSafeExecuteJavaScript` will be removed.  There is no alternative, please
+ensure your code works with this property enabled.  It has been enabled by default since Electron
+12.
+
+You will be affected by this change if you use either `webFrame.executeJavaScript` or `webFrame.executeJavaScriptInIsolatedWorld`. You will need to ensure that values returned by either of those methods are supported by the [Context Bridge API](api/context-bridge.md#parameter--error--return-type-support) as these methods use the same value passing semantics.

 ## Planned Breaking API Changes (13.0)

+### API Changed: `session.setPermissionCheckHandler(handler)`
+
+The `handler` methods first parameter was previously always a `webContents`, it can now sometimes be `null`.  You should use the `requestingOrigin`, `embeddingOrigin` and `securityOrigin` properties to respond to the permission check correctly.  As the `webContents` can be `null` it can no longer be relied on.
+
+```js
+// Old code
+session.setPermissionCheckHandler((webContents, permission) => {
+  if (webContents.getURL().startsWith('https://google.com/') && permission === 'notification') {
+    return true
+  }
+  return false
+})
+
+// Replace with
+session.setPermissionCheckHandler((webContents, permission, requestingOrigin) => {
+  if (new URL(requestingOrigin).hostname === 'google.com' && permission === 'notification') {
+    return true
+  }
+  return false
+})
+```
+
 ### Removed: `shell.moveItemToTrash()`

 The deprecated synchronous `shell.moveItemToTrash()` API has been removed. Use
@@ -26,6 +64,94 @@ shell.moveItemToTrash(path)
 shell.trashItem(path).then(/* ... */)
 ```

+### Removed: `BrowserWindow` extension APIs
+
+The deprecated extension APIs have been removed:
+
+* `BrowserWindow.addExtension(path)`
+* `BrowserWindow.addDevToolsExtension(path)`
+* `BrowserWindow.removeExtension(name)`
+* `BrowserWindow.removeDevToolsExtension(name)`
+* `BrowserWindow.getExtensions()`
+* `BrowserWindow.getDevToolsExtensions()`
+
+Use the session APIs instead:
+
+* `ses.loadExtension(path)`
+* `ses.removeExtension(extension_id)`
+* `ses.getAllExtensions()`
+
+```js
+// Removed in Electron 13
+BrowserWindow.addExtension(path)
+BrowserWindow.addDevToolsExtension(path)
+// Replace with
+session.defaultSession.loadExtension(path)
+```
+
+```js
+// Removed in Electron 13
+BrowserWindow.removeExtension(name)
+BrowserWindow.removeDevToolsExtension(name)
+// Replace with
+session.defaultSession.removeExtension(extension_id)
+```
+
+```js
+// Removed in Electron 13
+BrowserWindow.getExtensions()
+BrowserWindow.getDevToolsExtensions()
+// Replace with
+session.defaultSession.getAllExtensions()
+```
+
+### Removed: methods in `systemPreferences`
+
+The following `systemPreferences` methods have been deprecated:
+
+* `systemPreferences.isDarkMode()`
+* `systemPreferences.isInvertedColorScheme()`
+* `systemPreferences.isHighContrastColorScheme()`
+
+Use the following `nativeTheme` properties instead:
+
+* `nativeTheme.shouldUseDarkColors`
+* `nativeTheme.shouldUseInvertedColorScheme`
+* `nativeTheme.shouldUseHighContrastColors`
+
+```js
+// Removed in Electron 13
+systemPreferences.isDarkMode()
+// Replace with
+nativeTheme.shouldUseDarkColors
+
+// Removed in Electron 13
+systemPreferences.isInvertedColorScheme()
+// Replace with
+nativeTheme.shouldUseInvertedColorScheme
+
+// Removed in Electron 13
+systemPreferences.isHighContrastColorScheme()
+// Replace with
+nativeTheme.shouldUseHighContrastColors
+```
+
+### Deprecated: WebContents `new-window` event
+
+The `new-window` event of WebContents has been deprecated. It is replaced by [`webContents.setWindowOpenHandler()`](api/web-contents.md#contentssetwindowopenhandlerhandler).
+
+```js
+// Deprecated in Electron 13
+webContents.on('new-window', (event) => {
+  event.preventDefault()
+})
+
+// Replace with
+webContents.setWindowOpenHandler((details) => {
+  return { action: 'deny' }
+})
+```
+
 ## Planned Breaking API Changes (12.0)

 ### Removed: Pepper Flash support
@@ -34,6 +160,15 @@ Chromium has removed support for Flash, and so we must follow suit. See
 Chromium's [Flash Roadmap](https://www.chromium.org/flash-roadmap) for more
 details.

+### Default Changed: `worldSafeExecuteJavaScript` defaults to `true`
+
+In Electron 12, `worldSafeExecuteJavaScript` will be enabled by default.  To restore
+the previous behavior, `worldSafeExecuteJavaScript: false` must be specified in WebPreferences.
+Please note that setting this option to `false` is **insecure**.
+
+This option will be removed in Electron 14 so please migrate your code to support the default
+value.
+
 ### Default Changed: `contextIsolation` defaults to `true`

 In Electron 12, `contextIsolation` will be enabled by default.  To restore
@@ -41,19 +176,34 @@ the previous behavior, `contextIsolation: false` must be specified in WebPrefere

 We [recommend having contextIsolation enabled](https://github.com/electron/electron/blob/master/docs/tutorial/security.md#3-enable-context-isolation-for-remote-content) for the security of your application.

+Another implication is that `require()` cannot be used in the renderer process unless
+`nodeIntegration` is `true` and `contextIsolation` is `false`.
+
 For more details see: https://github.com/electron/electron/issues/23506

+### Removed: `crashReporter.getCrashesDirectory()`
+
+The `crashReporter.getCrashesDirectory` method has been removed. Usage
+should be replaced by `app.getPath('crashDumps')`.
+
+```js
+// Removed in Electron 12
+crashReporter.getCrashesDirectory()
+// Replace with
+app.getPath('crashDumps')
+```
+
 ### Removed: `crashReporter` methods in the renderer process

 The following `crashReporter` methods are no longer available in the renderer
 process:

- `crashReporter.start`
- `crashReporter.getLastCrashReport`
- `crashReporter.getUploadedReports`
- `crashReporter.getUploadToServer`
- `crashReporter.setUploadToServer`
- `crashReporter.getCrashesDirectory`
+* `crashReporter.start`
+* `crashReporter.getLastCrashReport`
+* `crashReporter.getUploadedReports`
+* `crashReporter.getUploadToServer`
+* `crashReporter.setUploadToServer`
+* `crashReporter.getCrashesDirectory`

 They should be called only from the main process.

@@ -104,6 +254,7 @@ shell.trashItem(path).then(/* ... */)
 ## Planned Breaking API Changes (11.0)

 ### Removed: `BrowserView.{destroy, fromId, fromWebContents, getAllViews}` and `id` property of `BrowserView`
+
 The experimental APIs `BrowserView.{destroy, fromId, fromWebContents, getAllViews}`
 have now been removed. Additionally, the `id` property of `BrowserView`
 has also been removed.
@@ -143,12 +294,12 @@ app.getPath('crashDumps')
 Calling the following `crashReporter` methods from the renderer process is
 deprecated:

- `crashReporter.start`
- `crashReporter.getLastCrashReport`
- `crashReporter.getUploadedReports`
- `crashReporter.getUploadToServer`
- `crashReporter.setUploadToServer`
- `crashReporter.getCrashesDirectory`
+* `crashReporter.start`
+* `crashReporter.getLastCrashReport`
+* `crashReporter.getUploadedReports`
+* `crashReporter.getUploadToServer`
+* `crashReporter.setUploadToServer`
+* `crashReporter.getCrashesDirectory`

 The only non-deprecated methods remaining in the `crashReporter` module in the
 renderer are `addExtraParameter`, `removeExtraParameter` and `getParameters`.
@@ -190,6 +341,7 @@ We [recommend moving away from the remote
 module](https://medium.com/@nornagon/electrons-remote-module-considered-harmful-70d69500f31).

 ### `protocol.unregisterProtocol`
+
 ### `protocol.uninterceptProtocol`

 The APIs are now synchronous and the optional callback is no longer needed.
@@ -202,14 +354,23 @@ protocol.unregisterProtocol(scheme)
 ```

 ### `protocol.registerFileProtocol`
+
 ### `protocol.registerBufferProtocol`
+
 ### `protocol.registerStringProtocol`
+
 ### `protocol.registerHttpProtocol`
+
 ### `protocol.registerStreamProtocol`
+
 ### `protocol.interceptFileProtocol`
+
 ### `protocol.interceptStringProtocol`
+
 ### `protocol.interceptBufferProtocol`
+
 ### `protocol.interceptHttpProtocol`
+
 ### `protocol.interceptStreamProtocol`

 The APIs are now synchronous and the optional callback is no longer needed.
@@ -251,6 +412,47 @@ you should plan to update your native modules to be context aware.

 For more detailed information see [#18397](https://github.com/electron/electron/issues/18397).

+### Deprecated: `BrowserWindow` extension APIs
+
+The following extension APIs have been deprecated:
+
+* `BrowserWindow.addExtension(path)`
+* `BrowserWindow.addDevToolsExtension(path)`
+* `BrowserWindow.removeExtension(name)`
+* `BrowserWindow.removeDevToolsExtension(name)`
+* `BrowserWindow.getExtensions()`
+* `BrowserWindow.getDevToolsExtensions()`
+
+Use the session APIs instead:
+
+* `ses.loadExtension(path)`
+* `ses.removeExtension(extension_id)`
+* `ses.getAllExtensions()`
+
+```js
+// Deprecated in Electron 9
+BrowserWindow.addExtension(path)
+BrowserWindow.addDevToolsExtension(path)
+// Replace with
+session.defaultSession.loadExtension(path)
+```
+
+```js
+// Deprecated in Electron 9
+BrowserWindow.removeExtension(name)
+BrowserWindow.removeDevToolsExtension(name)
+// Replace with
+session.defaultSession.removeExtension(extension_id)
+```
+
+```js
+// Deprecated in Electron 9
+BrowserWindow.getExtensions()
+BrowserWindow.getDevToolsExtensions()
+// Replace with
+session.defaultSession.getAllExtensions()
+```
+
 ### Removed: `<webview>.getWebContents()`

 This API, which was deprecated in Electron 8.0, is now removed.
@@ -303,7 +505,7 @@ Clone Algorithm][SCA], the same algorithm used to serialize messages for
 `postMessage`. This brings about a 2x performance improvement for large
 messages, but also brings some breaking changes in behavior.

- Sending Functions, Promises, WeakMaps, WeakSets, or objects containing any
+* Sending Functions, Promises, WeakMaps, WeakSets, or objects containing any
  such values, over IPC will now throw an exception, instead of silently
  converting the functions to `undefined`.

@@ -317,21 +519,21 @@ ipcRenderer.send('channel', { value: 3, someFunction: () => {} })
 // => throws Error("() => {} could not be cloned.")
 ```

- `NaN`, `Infinity` and `-Infinity` will now be correctly serialized, instead
+* `NaN`, `Infinity` and `-Infinity` will now be correctly serialized, instead
  of being converted to `null`.
- Objects containing cyclic references will now be correctly serialized,
+* Objects containing cyclic references will now be correctly serialized,
  instead of being converted to `null`.
- `Set`, `Map`, `Error` and `RegExp` values will be correctly serialized,
+* `Set`, `Map`, `Error` and `RegExp` values will be correctly serialized,
  instead of being converted to `{}`.
- `BigInt` values will be correctly serialized, instead of being converted to
+* `BigInt` values will be correctly serialized, instead of being converted to
  `null`.
- Sparse arrays will be serialized as such, instead of being converted to dense
+* Sparse arrays will be serialized as such, instead of being converted to dense
  arrays with `null`s.
- `Date` objects will be transferred as `Date` objects, instead of being
+* `Date` objects will be transferred as `Date` objects, instead of being
  converted to their ISO string representation.
- Typed Arrays (such as `Uint8Array`, `Uint16Array`, `Uint32Array` and so on)
+* Typed Arrays (such as `Uint8Array`, `Uint16Array`, `Uint32Array` and so on)
  will be transferred as such, instead of being converted to Node.js `Buffer`.
- Node.js `Buffer` objects will be transferred as `Uint8Array`s. You can
+* Node.js `Buffer` objects will be transferred as `Uint8Array`s. You can
  convert a `Uint8Array` back to a Node.js `Buffer` by wrapping the underlying
  `ArrayBuffer`:

@@ -397,6 +599,55 @@ in Electron 8.x, and cease to exist in Electron 9.x. The layout zoom level
 limits are now fixed at a minimum of 0.25 and a maximum of 5.0, as defined
 [here](https://chromium.googlesource.com/chromium/src/+/938b37a6d2886bf8335fc7db792f1eb46c65b2ae/third_party/blink/common/page/page_zoom.cc#11).

+### Deprecated events in `systemPreferences`
+
+The following `systemPreferences` events have been deprecated:
+
+* `inverted-color-scheme-changed`
+* `high-contrast-color-scheme-changed`
+
+Use the new `updated` event on the `nativeTheme` module instead.
+
+```js
+// Deprecated
+systemPreferences.on('inverted-color-scheme-changed', () => { /* ... */ })
+systemPreferences.on('high-contrast-color-scheme-changed', () => { /* ... */ })
+
+// Replace with
+nativeTheme.on('updated', () => { /* ... */ })
+```
+
+### Deprecated: methods in `systemPreferences`
+
+The following `systemPreferences` methods have been deprecated:
+
+* `systemPreferences.isDarkMode()`
+* `systemPreferences.isInvertedColorScheme()`
+* `systemPreferences.isHighContrastColorScheme()`
+
+Use the following `nativeTheme` properties instead:
+
+* `nativeTheme.shouldUseDarkColors`
+* `nativeTheme.shouldUseInvertedColorScheme`
+* `nativeTheme.shouldUseHighContrastColors`
+
+```js
+// Deprecated
+systemPreferences.isDarkMode()
+// Replace with
+nativeTheme.shouldUseDarkColors
+
+// Deprecated
+systemPreferences.isInvertedColorScheme()
+// Replace with
+nativeTheme.shouldUseInvertedColorScheme
+
+// Deprecated
+systemPreferences.isHighContrastColorScheme()
+// Replace with
+nativeTheme.shouldUseHighContrastColors
+```
+
 ## Planned Breaking API Changes (7.0)

 ### Deprecated: Atom.io Node Headers URL
@@ -496,6 +747,55 @@ Note that `webkitdirectory` no longer exposes the path to the selected folder.
 If you require the path to the selected folder rather than the folder contents,
 see the `dialog.showOpenDialog` API ([link](https://github.com/electron/electron/blob/master/docs/api/dialog.md#dialogshowopendialogbrowserwindow-options)).

+### API Changed: Callback-based versions of promisified APIs
+
+Electron 5 and Electron 6 introduced Promise-based versions of existing
+asynchronous APIs and deprecated their older, callback-based counterparts.
+In Electron 7, all deprecated callback-based APIs are now removed.
+
+These functions now only return Promises:
+
+* `app.getFileIcon()` [#15742](https://github.com/electron/electron/pull/15742)
+* `app.dock.show()` [#16904](https://github.com/electron/electron/pull/16904)
+* `contentTracing.getCategories()` [#16583](https://github.com/electron/electron/pull/16583)
+* `contentTracing.getTraceBufferUsage()` [#16600](https://github.com/electron/electron/pull/16600)
+* `contentTracing.startRecording()` [#16584](https://github.com/electron/electron/pull/16584)
+* `contentTracing.stopRecording()` [#16584](https://github.com/electron/electron/pull/16584)
+* `contents.executeJavaScript()` [#17312](https://github.com/electron/electron/pull/17312)
+* `cookies.flushStore()` [#16464](https://github.com/electron/electron/pull/16464)
+* `cookies.get()` [#16464](https://github.com/electron/electron/pull/16464)
+* `cookies.remove()` [#16464](https://github.com/electron/electron/pull/16464)
+* `cookies.set()` [#16464](https://github.com/electron/electron/pull/16464)
+* `debugger.sendCommand()` [#16861](https://github.com/electron/electron/pull/16861)
+* `dialog.showCertificateTrustDialog()` [#17181](https://github.com/electron/electron/pull/17181)
+* `inAppPurchase.getProducts()` [#17355](https://github.com/electron/electron/pull/17355)
+* `inAppPurchase.purchaseProduct()`[#17355](https://github.com/electron/electron/pull/17355)
+* `netLog.stopLogging()` [#16862](https://github.com/electron/electron/pull/16862)
+* `session.clearAuthCache()` [#17259](https://github.com/electron/electron/pull/17259)
+* `session.clearCache()`  [#17185](https://github.com/electron/electron/pull/17185)
+* `session.clearHostResolverCache()` [#17229](https://github.com/electron/electron/pull/17229)
+* `session.clearStorageData()` [#17249](https://github.com/electron/electron/pull/17249)
+* `session.getBlobData()` [#17303](https://github.com/electron/electron/pull/17303)
+* `session.getCacheSize()`  [#17185](https://github.com/electron/electron/pull/17185)
+* `session.resolveProxy()` [#17222](https://github.com/electron/electron/pull/17222)
+* `session.setProxy()`  [#17222](https://github.com/electron/electron/pull/17222)
+* `shell.openExternal()` [#16176](https://github.com/electron/electron/pull/16176)
+* `webContents.loadFile()` [#15855](https://github.com/electron/electron/pull/15855)
+* `webContents.loadURL()` [#15855](https://github.com/electron/electron/pull/15855)
+* `webContents.hasServiceWorker()` [#16535](https://github.com/electron/electron/pull/16535)
+* `webContents.printToPDF()` [#16795](https://github.com/electron/electron/pull/16795)
+* `webContents.savePage()` [#16742](https://github.com/electron/electron/pull/16742)
+* `webFrame.executeJavaScript()` [#17312](https://github.com/electron/electron/pull/17312)
+* `webFrame.executeJavaScriptInIsolatedWorld()` [#17312](https://github.com/electron/electron/pull/17312)
+* `webviewTag.executeJavaScript()` [#17312](https://github.com/electron/electron/pull/17312)
+* `win.capturePage()` [#15743](https://github.com/electron/electron/pull/15743)
+
+These functions now have two forms, synchronous and Promise-based asynchronous:
+
+* `dialog.showMessageBox()`/`dialog.showMessageBoxSync()` [#17298](https://github.com/electron/electron/pull/17298)
+* `dialog.showOpenDialog()`/`dialog.showOpenDialogSync()` [#16973](https://github.com/electron/electron/pull/16973)
+* `dialog.showSaveDialog()`/`dialog.showSaveDialogSync()` [#17054](https://github.com/electron/electron/pull/17054)
+
 ## Planned Breaking API Changes (6.0)

 ### API Changed: `win.setMenu(null)` is now `win.removeMenu()`
@@ -507,19 +807,6 @@ win.setMenu(null)
 win.removeMenu()
 ```

-### API Changed: `contentTracing.getTraceBufferUsage()` is now a promise
-
-```js
-// Deprecated
-contentTracing.getTraceBufferUsage((percentage, value) => {
-  // do something
-})
-// Replace with
-contentTracing.getTraceBufferUsage().then(infoObject => {
-  // infoObject has percentage and value fields
-})
-```
-
 ### API Changed: `electron.screen` in the renderer process should be accessed via `remote`

 ```js
@@ -658,6 +945,31 @@ webFrame.setSpellCheckProvider('en-US', {
 })
 ```

+### API Changed: `webContents.getZoomLevel` and `webContents.getZoomFactor` are now synchronous
+
+`webContents.getZoomLevel` and `webContents.getZoomFactor` no longer take callback parameters,
+instead directly returning their number values.
+
+```js
+// Deprecated
+webContents.getZoomLevel((level) => {
+  console.log(level)
+})
+// Replace with
+const level = webContents.getZoomLevel()
+console.log(level)
+```
+
+```js
+// Deprecated
+webContents.getZoomFactor((factor) => {
+  console.log(factor)
+})
+// Replace with
+const factor = webContents.getZoomFactor()
+console.log(factor)
+```
+
 ## Planned Breaking API Changes (4.0)

 The following list includes the breaking API changes made in Electron 4.0.
--- a/docs/development/build-instructions-gn.md
+++ b/docs/development/build-instructions-gn.md
@@ -1,6 +1,8 @@
 # Build Instructions

-Follow the guidelines below for building Electron.
+Follow the guidelines below for building **Electron itself**, for the purposes of creating custom Electron binaries. For bundling and distributing your app code with the prebuilt Electron binaries, see the [application distribution][application-distribution] guide.
+
+[application-distribution]: ../tutorial/application-distribution.md

 ## Platform prerequisites

@@ -86,8 +88,6 @@ $ gclient sync -f
 ```sh
 $ cd src
 $ export CHROMIUM_BUILDTOOLS_PATH=`pwd`/buildtools
-# this next line is needed only if building with sccache
-$ export GN_EXTRA_ARGS="${GN_EXTRA_ARGS} cc_wrapper=\"${PWD}/electron/external_binaries/sccache\""
 $ gn gen out/Testing --args="import(\"//electron/build/args/testing.gn\") $GN_EXTRA_ARGS"
 ```

@@ -141,12 +141,6 @@ This will build all of what was previously 'libchromiumcontent' (i.e. the
 `content/` directory of `chromium` and its dependencies, incl. WebKit and V8),
 so it will take a while.

-To speed up subsequent builds, you can use [sccache][sccache]. Add the GN arg
-`cc_wrapper = "sccache"` by running `gn args out/Testing` to bring up an
-editor and adding a line to the end of the file.
-
-[sccache]: https://github.com/mozilla/sccache
-
 The built executable will be under `./out/Testing`:

 ```sh
@@ -189,7 +183,6 @@ Not all combinations of source and target CPU/OS are supported by Chromium.
 | Windows x64 | Windows x86   | Automatically tested |
 | Linux x64   | Linux x86     | Automatically tested |

-
 If you test other combinations and find them to work, please update this document :)

 See the GN reference for allowable values of [`target_os`][target_os values]
--- a/docs/development/build-instructions-linux.md
+++ b/docs/development/build-instructions-linux.md
@@ -1,6 +1,8 @@
 # Build Instructions (Linux)

-Follow the guidelines below for building Electron on Linux.
+Follow the guidelines below for building **Electron itself** on Linux, for the purposes of creating custom Electron binaries. For bundling and distributing your app code with the prebuilt Electron binaries, see the [application distribution][application-distribution] guide.
+
+[application-distribution]: ../tutorial/application-distribution.md

 ## Prerequisites

@@ -55,6 +57,15 @@ $ sudo dnf install clang dbus-devel gtk3-devel libnotify-devel \
                   nss-devel python-dbusmock openjdk-8-jre
 ```

+On Arch Linux / Manjaro, install the following libraries:
+
+```sh
+$ sudo pacman -Syu base-devel clang libdbus gtk2 libnotify \
+                   libgnome-keyring alsa-lib libcap libcups libxtst \
+                   libxss nss gcc-multilib curl gperf bison \
+                   python2 python-dbusmock jdk8-openjdk
+```
+
 Other distributions may offer similar packages for installation via package
 managers such as pacman. Or one can compile from source code.

--- a/docs/development/build-instructions-macos.md
+++ b/docs/development/build-instructions-macos.md
@@ -1,6 +1,8 @@
 # Build Instructions (macOS)

-Follow the guidelines below for building Electron on macOS.
+Follow the guidelines below for building **Electron itself** on macOS, for the purposes of creating custom Electron binaries. For bundling and distributing your app code with the prebuilt Electron binaries, see the [application distribution][application-distribution] guide.
+
+[application-distribution]: ../tutorial/application-distribution.md

 ## Prerequisites

@@ -42,7 +44,7 @@ $ pip install pyobjc
 If you're developing Electron and don't plan to redistribute your
 custom Electron build, you may skip this section.

-Official Electron builds are built with [Xcode 9.4.1](http://adcdownload.apple.com/Developer_Tools/Xcode_9.4.1/Xcode_9.4.1.xip), and the macOS 10.13 SDK.  Building with a newer SDK works too, but the releases currently use the 10.13 SDK.
+Official Electron builds are built with [Xcode 12.2](https://download.developer.apple.com/Developer_Tools/Xcode_12.2/Xcode_12.2.xip), and the macOS 11.0 SDK. Building with a newer SDK works too, but the releases currently use the 11.0 SDK.

 ## Building Electron

--- a/Show More
+++ b/Show More