Support for support/viewport/page directives. Fixes #847 and fixes #366

test/less/css-3.less

@@ -68,10 +68,40 @@ p::before {
   100% { border: 3px }
 }
 
+@keyframes fontbulger1 {
+  to {
+    font-size: 15px;
+  }
+  from,to {
+    font-size: 12px;
+  }
+  0%,100% {
+    font-size: 12px;
+  }
+}
+
 .units {
   font: 1.2rem/2rem;
   font: 8vw/9vw;
   font: 10vh/12vh;
   font: 12vm/15vm;
   font: 1.2ch/1.5ch;
-}
+}
+
+@supports ( box-shadow: 2px 2px 2px black ) or
+          ( -moz-box-shadow: 2px 2px 2px black ) {
+  .outline {
+    box-shadow: 2px 2px 2px black;
+    -moz-box-shadow: 2px 2px 2px black;
+  }
+}
+
+@-x-document url-prefix(""github.com"") {
+  h1 {
+    color: red;
+  }
+}
+
+@viewport {
+  font-size: 10px;
+}

test/less/media.less

@@ -81,3 +81,66 @@ body {
 @media @smartphone {
   width: 480px;
 }
+
+@media print {
+  @page :left {
+    margin: 0.5cm;
+  }
+  @page :right {
+    margin: 0.5cm;
+  }
+  @page Test:first {
+    margin: 1cm;
+  }
+  @page :first {
+    size: 8.5in 11in;
+	@top-left {
+      margin: 1cm;
+    }
+    @top-left-corner {
+      margin: 1cm;
+    }
+    @top-center {
+      margin: 1cm;
+    }
+    @top-right {
+      margin: 1cm;
+    }
+    @top-right-corner {
+      margin: 1cm;
+    }
+    @bottom-left {
+      margin: 1cm;
+    }
+    @bottom-left-corner {
+      margin: 1cm;
+    }
+    @bottom-center {
+      margin: 1cm;
+    }
+    @bottom-right {
+      margin: 1cm;
+    }
+    @bottom-right-corner {
+      margin: 1cm;
+    }
+    @left-top {
+      margin: 1cm;
+    }
+    @left-middle {
+      margin: 1cm;
+    }
+    @left-bottom {
+      margin: 1cm;
+    }
+    @right-top {
+      margin: 1cm;
+    }
+    @right-middle {
+      content: "Page " counter(page);
+    }
+    @right-bottom {
+      margin: 1cm;
+    }
+  }
+}