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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html Multipage: http://www.whatwg.org/C#safe-passing-of-structured-data Complete: http://www.whatwg.org/c#safe-passing-of-structured-data Comment: Gecko and WebKit+V8, at least, support it. And things like the Peacekeeper benchmark depend on it.
Not sure how this broke. Must've accidentally removed ImageData when I removed CanvasPixelArray or something.