Created attachment 8339652 [details] testcase Assertion failure: elementSize.height == mCurrentContext->GetHeight() || (elementSize.height == 0 && mCurrentContext->GetHeight() == 1), at content/html/content/src/HTMLCanvasElement.cpp:525
Alright, so we're resizing the canvas height to <big>, which naturally fails to resize the GL context, which is fine. It looks like this assert checks that the canvas and renderingContext's width and height match, which isn't guaranteed. Specifically, the sizes *will* differ if you request a too-large size.
Assignee: nobody → jgilbert
Assertion failure: elementSize.width == mCurrentContext->GetWidth() || (elementSize.width == 0 && mCurrentContext->GetWidth() == 1), at content/html/content/src/HTMLCanvasElement.cpp:519
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