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In accordance with Web IDL, CanvasRenderingContext2D createPattern(null, ...) should raise TypeError and not TYPE_MISMATCH_ERR.
Oops, forgot to mention this is with regard to the 2d.pattern.image.null.html test in Philip Taylor's canvas test suite.
createPattern, createImageData, putImageData as well.
I think this was fixed by bug 10640.
http://dvcs.w3.org/hg/html/rev/9869aaee0eb6 Philip or Cameron, could you review?
Cameron approved.
http://dvcs.w3.org/hg/html/rev/561b1496720f