Update.

javascript-workers.md

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+## Web workers
+
+    // Client code
+
+    var worker = new Worker('worker.js');
+    worker.onmessage = function(message) {
+      alert(message.data);
+    });
+    worker.postMessage("");
+
+### Worker code
+
+    // worker.js
+
+    self.onmessage = function(message) {
+      alert(message.data);
+    }
+    self.postMessage("");
+
+### Message data
+
+    // [MessageEvent]
+    bubbles: false
+    cancelBubble: false
+    cancelable: false
+    clipboardData: undefined
+    currentTarget: Worker
+    data: "Hello"
+    defaultPrevented: false
+    eventPhase: 0
+    lastEventId: ""
+    origin: ""
+    ports: Array[0]
+    returnValue: true
+    source: null
+    srcElement: Worker
+    target: Worker
+    timeStamp: 1344821022383
+    type: "message"
+
+
+
+