A bunch more documentation.

tools/dom/docs/docs.json

 {
   "dart.dom.html": {
     "CanvasGradient": {
       "comment": [
         "/**",
         " * An opaque canvas object representing a gradient.",
         " *",
         " * Created by calling [createLinearGradient] or [createRadialGradient] on a",
         " * [CanvasRenderingContext2D] object.",
         " *",
@@ skipping 86 matching lines @@
         "body": [
           "/// Moved to [HtmlDocument]."
         ],
         "caretRangeFromPoint": [
           "/// Use the [Range] constructor instead."
         ],
         "createElement": [
           "/// Deprecated: use new Element.tag(tagName) instead."
         ],
         "createTouchList": [
-          "/// Use the [TouchList] constructor isntead."
+          "/// Use the [TouchList] constructor instead."
         ],
         "getCSSCanvasContext": [
           "/// Moved to [HtmlDocument]."
         ],
         "getElementById": [
           "/// Deprecated: use query(\"#$elementId\") instead."
         ],
         "head": [
           "/// Moved to [HtmlDocument]."
         ],
@@ skipping 163 matching lines @@
         ],
         "overrideMimeType": [
           "/**",
           "   * Specify a particular MIME type (such as `text/xml`) desired for the",
           "   * response.",
           "   *",
           "   * This value must be set before the request has been sent. See also the list",
           "   * of [common MIME types](http://en.wikipedia.org/wiki/Internet_media_type#List_of_common_media_types)",
           "   */"
         ],
+        "readyState": [
+          "/**",
+          "   * Indicator of the current state of the request:",
+          "   *",
+          "   * <table>",
+          "   *   <tr>",
+          "   *     <td>Value</td>",
+          "   *     <td>State</td>",
+          "   *     <td>Meaning</td>",
+          "   *   </tr>",
+          "   *   <tr>",
+          "   *     <td>0</td>",
+          "   *     <td>unsent</td>",
+          "   *     <td><code>open()</code> has not yet been called</td>",
+          "   *   </tr>",
+          "   *   <tr>",
+          "   *     <td>1</td>",
+          "   *     <td>opened</td>",
+          "   *     <td><code>send()</code> has not yet been called</td>",
+          "   *   </tr>",
+          "   *   <tr>",
+          "   *     <td>2</td>",
+          "   *     <td>headers received</td>",
+          "   *     <td><code>sent()</code> has been called; response headers and <code>status</code> are available</td>",
+          "   *   </tr>",
+          "   *   <tr>",
+          "   *     <td>3</td> <td>loading</td> <td><code>responseText</code> holds some data</td>",
+          "   *   </tr>",
+          "   *   <tr>",
+          "   *     <td>4</td> <td>done</td> <td>request is complete</td>",
+          "   *   </tr>",
+          "   * </table>",
+          "   */"
+        ],
         "response": [
           "/**",
           "   * The data received as a reponse from the request.",
           "   *",
           "   * The data could be in the",
           "   * form of a [String], [ArrayBuffer], [Document], [Blob], or json (also a",
           "   * [String]). `null` indicates request failure.",
           "   */"
         ],
         "responseText": [
           "/**",
           "   * The response in string form or `null on failure.",
           "   */"
         ],
         "responseType": [
           "/**",
           "   * [String] telling the server the desired response format.",
           "   *",
           "   * Default is `String`.",
           "   * Other options are one of 'arraybuffer', 'blob', 'document', 'json',",
           "   * 'text'. Some newer browsers will throw NS_ERROR_DOM_INVALID_ACCESS_ERR if",
           "   * `responseType` is set while performing a synchronous request.",
           "   *",
           "   * See also: [MDN responseType](https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest#responseType)",
           "   */"
         ],
+        "responseXML": [
+          "/**",
+          "   * The request response, or null on failure.",
+          "   *",
+          "   * The response is processed as",
+          "   * `text/xml` stream, unless responseType = 'document' and the request is",
+          "   * synchronous.",
+          "   */"
+        ],
         "send": [
           "/**",
           "   * Send the request with any given `data`.",
           "   *",
           "   * See also:",
           "   * [send() docs](https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest#send())",
           "   * from MDN.",
           "   */"
         ],
         "status": [
@@ skipping 27 matching lines @@
           "   * General constructor for any type of request (GET, POST, etc).",
           "   *",
           "   * This call is used in conjunction with [open]:",
           "   *",
           "   *     var request = new HttpRequest();",
           "   *     request.open('GET', 'http://dartlang.org')",
           "   *     request.on.load.add((event) => print('Request complete'));",
           "   *",
           "   * is the (more verbose) equivalent of",
           "   *",
-          "   *     var request = new HttpRequest.get('http://dartlang.org', (event) => print('Request complete'));",
+          "   *     var request = new HttpRequest.get('http://dartlang.org',",
+          "   *         (event) => print('Request complete'));",
           "   */"
         ]
       }
     }
   }
 }