The clear() method used to remove all elements from a WeakSet object, but is no longer part of ECMAScript and its implementations.
Represents an error that occurs while using the FileReader interface.
The HTMLCanvasElement.mozFetchAsStream() internal method used to create a new input stream that, when ready, would provide the contents of the canvas as image data. However, this non-standard and internal method has been removed.
The HTMLFrameSetElement interface provides special properties (beyond those of the regular HTMLElement interface they also inherit) for manipulating <frameset> elements.
For older WebKit browsers, call this method before creating or deleting an object store.