Webkit is what Chrome and Safari use, and is your target for most mobile web development since it is used as the layout or rendering engine for Android devices as well as mobile Safari for iOS devices and the Silk browser on Kindle Fires.

Call getContext() with the argument "2d to obtain a CanvasRenderingContext2D object that you can use to draw two-dimensional graphics into the canvas. It is important to understand that the canvas element and its context object are two very different objects.

The JavaScript Engine is generally used for interpreting the JavaScript.

The canvas element is not supported by IE before IE9, but it can be reasonably well emulated in IE6, 7, and 8.

The remote server finds the resource and returns it in an HTTP Response, the status of which is 200 to indicate a good response.

The beginPath() is used to begin a new path.

The video tag does not contain a breadth property.

The audio tag is used to include audio in the HTML document.

Web pages include images using the HTML img element.

Both audio and video support a controls attribute.