* The canvas element: Canvas consists of a drawable region defined in
HTML code with height and width attributes. JavaScript code may access
the area through a full set of drawing functions similar to
other common 2D APIs, thus allowing for dynamically generated graphics.
Some anticipated uses of the canvas include building graphs, animations,
games, and image composition.
* Timed media playback
* Offline storage database
* Document editing
* Drag-and-drop
* Cross-document messaging
* Browser history management
* MIME type and protocol handler registration