Hi WebKittens, I'm planning to implement the canvas "opaque" attribute, as proposed here: http://lists.w3.org/Archives/Public/public-whatwg-archive/2013Mar/0109.html.
This is an attribute that causes the allocation of an opaque backing store for <canvas>, allowing optimizations at the time the canvas is composited into the page, such as disabling blending and culling obscured content. It is based on the moz-opaque attribute currently shipping in Firefox. I'll be placing the feature behind the build-time flag ENABLE(OPAQUE_CANVAS). Let me know if you have any comments or concerns. Stephen
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