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I can't think of any browser facility that would be able to verify the animation and final generated appearance. How would you do that?

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Yeah, I don't think it's possible. But it is confusing that it isn't possible and therefore isn't done in this test.

Have browser send screenshot to Mechanical Turk and offer 1 cent for the answer to the question: "Is this image identical to this image?" :)

FWIW, my Firefox 6.0.2 gets 100/100 but the resulting image does NOT look, pixel-for-pixel, identical to the reference image. Ah, but I guess it's only required for default settings, so perhaps that is the problem - non-default settings on my end.

I'm pretty sure there's no way for a browser to take a screenshot of itself.

It's possible, but not perfect.

http://html2canvas.hertzen.com/

It's a subset of HTML and CSS, not the whole thing. Interesting though.

Click on the A in Acid3. It will show a dialogue box which will tell you if the animation lagged.

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