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Google Chrome Team is experimenting with opaque canvas in the last chromium build. 

And if you're interested in, you can enable "experimental canvas features" flag in chrome://flags and play with it by setting your context with canvas.getContext('2d', { alpha: false });
Screenshot below shows you that an opaque canvas has a black background whereas the "normal" one is transparent.

Good students will appreciate the WhatWG proposal at

David Michael's profile photoVibhor Mittal's profile photoMichal Chovanec's profile photoRicardo Cabello's profile photo
Is this intended to make it easier for Chrome to do accelerated compositing?
canvas.getContext('2d', { antialias: false }); next? :)_
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