[Webkit-unassigned] [Bug 117093] New: HTMLCanvasElement supportsContext function does not account for optional attributes parameters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117093

           Summary: HTMLCanvasElement supportsContext function does not
                    account for optional attributes parameters
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ruthiecftg at gmail.com
                CC: dino at apple.com, webkit-bug-importer at group.apple.com


Once landed, the patch for bug 70117 (https://bugs.webkit.org/show_bug.cgi?id=70117) implements the supportsContext function for HTMLCanvasElement as spec'ed in HTML standards (http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-canvas-supportscontext).

HTML standards states that "The supportsContext(contextId, arguments...) method of the canvas element, when invoked, must return false if calling getContext() on the same object and with the same arguments would definitely return null at this time, and true otherwise."

The patch for bug 70117 will not account for the optional arguments, i.e. it's return value is only based on the contextId parameter.

supportsContext function (implemented in Source/WebCore/html/HTMLCanvasElement.cpp after the patch for bug 70117 lands) should be updated to account for the optional parameters.

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