Added DivElement documentation.

sdk/lib/html/docs/html_docs.json

 {
 "MenuElement.dart":
   {
   "class MenuElement extends Element implements Element native \"*HTMLMenuElement\" {":
     [
       "/**",
       " * An HTML <menu> element.",
       " *",
       " * A <menu> element represents an unordered list of menu commands.",
       " *",
@@ skipping 1239 matching lines @@
 "FileError.dart":
   {
 
   },
 "Performance.dart":
   {
 
   },
 "DivElement.dart":
   {
-
+  "class DivElement extends Element implements Element native \"*HTMLDivElement\" {":
+    [
+      "/**",
+      " * Represents an HTML <div> element.",
+      " *",
+      " * The [DivElement] is a generic container for content and does not have any",
+      " * special significance. It is functionally similar to [SpanElement].",
+      " *",
+      " * The [DivElement] is a block-level element, as opposed to [SpanElement],",
+      " * which is an inline-level element.",
+      " *",
+      " * Example usage:",
+      " *",
+      " *     DivElement div = new DivElement();",
+      " *     div.text = 'Here's my new DivElem",
+      " *     document.body.elements.add(elem);",
+      " *",
+      " * See also:",
+      " *",
+      " * * [HTML <div> element](http://www.w3.org/TR/html-markup/div.html) from W3C.",
+      " * * [Block-level element](http://www.w3.org/TR/CSS2/visuren.html#block-boxes) from W3C.",
+      " * * [Inline-level element](http://www.w3.org/TR/CSS2/visuren.html#inline-boxes) from W3C.",
+      " */"
+    ]
   },
 "AnalyserNode.dart":
   {
 
   },
 "AudioBuffer.dart":
   {
 
   },
 "SQLTransactionSyncCallback.dart":
@@ skipping 354 matching lines @@
   },
 "WaveShaperNode.dart":
   {
 
   },
 "MediaKeyError.dart":
   {
 
   }
 }