Even more docs changes.

tools/dom/src/CrossFrameTypes.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of html;
 
 /**
  * Top-level container for a browser tab or window.
  *
  * In a web browser, a [WindowBase] object represents any browser window. This
@@ skipping 15 matching lines @@
 abstract class WindowBase implements EventTarget {
   // Fields.
 
   /**
    * The current location of this window.
    *
    *     Location currentLocation = window.location;
    *     print(currentLocation.href); // 'http://www.example.com:80/'
    */
   LocationBase get location;
+
+  /**
+   * The current session history for this window.
+   *
+   * ## Other resources
+   *
+   * * [Session history and navigation specification]
+   * (http://www.whatwg.org/specs/web-apps/current-work/multipage/history.html)
+   * from WHATWG.
+   */
   HistoryBase get history;
 
   /**
    * Indicates whether this window has been closed.
    *
    *     print(window.closed); // 'false'
    *     window.close();
    *     print(window.closed); // 'true'
    */
   bool get closed;
@@ skipping 65 matching lines @@
    *     window.location('http://www.mysite.com', 'foo');
    *     // Does not close this window, as the history has changed.
    *     window.close();
    *     print(window.closed()); // 'false'
    *
    * See also:
    *
    * * [Window close discussion](http://www.w3.org/TR/html5/browsers.html#dom-window-close) from the W3C
    */
   void close();
+
+  /**
+   * Sends a cross-origin message.
+   *
+   * ## Other resources
+   *
+   * * [window.postMessage]
+   * (https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage) from
+   * MDN.
+   * * [Cross-document messaging]
+   * (http://www.whatwg.org/specs/web-apps/current-work/multipage/web-messaging.html)
+   * from WHATWG.
+   */
   void postMessage(var message, String targetOrigin, [List messagePorts]);
 }
 
 abstract class LocationBase {
   void set href(String val);
 }
 
 abstract class HistoryBase {
   void back();
   void forward();
   void go(int distance);
 }