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The clear() method used to remove all elements from a WeakSet object, but is no longer part of ECMAScript and its implementations.
JavaScript Method Obsolete Prototype WeakSet


Represents an error that occurs while using the FileReader interface.
API File API Files Obsolete Reference


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.
API Canvas HTMLCanvasElement Method Obsolete Reference


The HTMLFrameSetElement interface provides special properties (beyond those of the regular HTMLElement interface they also inherit) for manipulating <frameset> elements.
API HTML-DOM HTMLFrameSetElement Interface Obsolete Reference


For older WebKit browsers, call this method before creating or deleting an object store.
API Method NeedsExample Obsolete Reference Référence