Added named constructors to Element to construct common elements.

sdk/lib/html/dart2js/html_dart2js.dart

 /// The Dart HTML library.
 ///
 /// For examples, see
 /// [Dart HTML5 Samples](https://github.com/dart-lang/dart-html5-samples)
 /// on Github.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol;
@@ skipping 7865 matching lines @@
    * For standard elements it is more preferable to use the type constructors:
    *     var element = new DivElement();
    *
    * See also:
    *
    * * [isTagSupported]
    */
   factory Element.tag(String tag) =>
       _ElementFactoryProvider.createElement_tag(tag);
 
+  /// Creates a new `<a>` element.
+  ///
+  /// This is identical to calling `new Element.tag(a)`.
+  factory Element.a() => new Element.tag(a);
+
+  /// Creates a new `<article>` element.
+  ///
+  /// This is identical to calling `new Element.tag(article)`.
+  factory Element.article() => new Element.tag(article);
+
+  /// Creates a new `<aside>` element.
+  ///
+  /// This is identical to calling `new Element.tag(aside)`.
+  factory Element.aside() => new Element.tag(aside);
+
+  /// Creates a new `<audio>` element.
+  ///
+  /// This is identical to calling `new Element.tag(audio)`.
+  factory Element.audio() => new Element.tag(audio);
+
+  /// Creates a new `<br>` element.
+  ///
+  /// This is identical to calling `new Element.tag(br)`.
+  factory Element.br() => new Element.tag(br);
+
+  /// Creates a new `<canvas>` element.
+  ///
+  /// This is identical to calling `new Element.tag(canvas)`.
+  factory Element.canvas() => new Element.tag(canvas);
+
+  /// Creates a new `<div>` element.
+  ///
+  /// This is identical to calling `new Element.tag(div)`.
+  factory Element.div() => new Element.tag(div);
+
+  /// Creates a new `<footer>` element.
+  ///
+  /// This is identical to calling `new Element.tag(footer)`.
+  factory Element.footer() => new Element.tag(footer);
+
+  /// Creates a new `<header>` element.
+  ///
+  /// This is identical to calling `new Element.tag(header)`.
+  factory Element.header() => new Element.tag(header);
+
+  /// Creates a new `<hr>` element.
+  ///
+  /// This is identical to calling `new Element.tag(hr)`.
+  factory Element.hr() => new Element.tag(hr);
+
+  /// Creates a new `<iframe>` element.
+  ///
+  /// This is identical to calling `new Element.tag(iframe)`.
+  factory Element.iframe() => new Element.tag(iframe);
+
+  /// Creates a new `<img>` element.
+  ///
+  /// This is identical to calling `new Element.tag(img)`.
+  factory Element.img() => new Element.tag(img);
+
+  /// Creates a new `<li>` element.
+  ///
+  /// This is identical to calling `new Element.tag(li)`.
+  factory Element.li() => new Element.tag(li);
+
+  /// Creates a new `<nav>` element.
+  ///
+  /// This is identical to calling `new Element.tag(nav)`.
+  factory Element.nav() => new Element.tag(nav);
+
+  /// Creates a new `<ol>` element.
+  ///
+  /// This is identical to calling `new Element.tag(ol)`.
+  factory Element.ol() => new Element.tag(ol);
+
+  /// Creates a new `<option>` element.
+  ///
+  /// This is identical to calling `new Element.tag(option)`.
+  factory Element.option() => new Element.tag(option);
+
+  /// Creates a new `<p>` element.
+  ///
+  /// This is identical to calling `new Element.tag(p)`.
+  factory Element.p() => new Element.tag(p);
+
+  /// Creates a new `<pre>` element.
+  ///
+  /// This is identical to calling `new Element.tag(pre)`.
+  factory Element.pre() => new Element.tag(pre);
+
+  /// Creates a new `<section>` element.
+  ///
+  /// This is identical to calling `new Element.tag(section)`.
+  factory Element.section() => new Element.tag(section);
+
+  /// Creates a new `<select>` element.
+  ///
+  /// This is identical to calling `new Element.tag(select)`.
+  factory Element.select() => new Element.tag(select);
+
+  /// Creates a new `<span>` element.
+  ///
+  /// This is identical to calling `new Element.tag(span)`.
+  factory Element.span() => new Element.tag(span);
+
+  /// Creates a new `<svg>` element.
+  ///
+  /// This is identical to calling `new Element.tag(svg)`.
+  factory Element.svg() => new Element.tag(svg);
+
+  /// Creates a new `<table>` element.
+  ///
+  /// This is identical to calling `new Element.tag(table)`.
+  factory Element.table() => new Element.tag(table);
+
+  /// Creates a new `<td>` element.
+  ///
+  /// This is identical to calling `new Element.tag(td)`.
+  factory Element.td() => new Element.tag(td);
+
+  /// Creates a new `<textarea>` element.
+  ///
+  /// This is identical to calling `new Element.tag(textarea)`.
+  factory Element.textarea() => new Element.tag(textarea);
+
+  /// Creates a new `<th>` element.
+  ///
+  /// This is identical to calling `new Element.tag(th)`.
+  factory Element.th() => new Element.tag(th);
+
+  /// Creates a new `<tr>` element.
+  ///
+  /// This is identical to calling `new Element.tag(tr)`.
+  factory Element.tr() => new Element.tag(tr);
+
+  /// Creates a new `<ul>` element.
+  ///
+  /// This is identical to calling `new Element.tag(ul)`.
+  factory Element.ul() => new Element.tag(ul);
+
+  /// Creates a new `<video>` element.
+  ///
+  /// This is identical to calling `new Element.tag(video)`.
+  factory Element.video() => new Element.tag(video);
+
   /**
    * All attributes on this element.
    *
    * Any modifications to the attribute map will automatically be applied to
    * this element.
    *
    * This only includes attributes which are not in a namespace
    * (such as 'xlink:href'), additional attributes can be accessed via
    * [getNamespacedAttributes].
    */
@@ skipping 20895 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }