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I believe there is an extra layer of indirection in chrome. IE can implement WebGL using DirectX, while chrome uses OpenGL, which under windows is a wrapper over DirectX. This may not be true of all video cards/drivers but I believe it's the default implementation of OpenGL under windows.

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OpenGL has never been implemented in terms of DirectX on windows. No idea what you are talking about here.

When Vista first came out, Microsoft forced OpenGL to be a layer above DirectX. But they pretty quickly backed down and let people build direct OpenGL drivers again.

Ah, this is where I got it from. I didn't realize they changed it back.

Yeah, I know this is true for the AMD driver, at least. Their Catalyst ("fglrx") OpenGL implementation is shared between Linux and Windows, with a fairly low-level wrapper for each OS. [1][2]

[1] http://www.phoronix.com/forums/showthread.php?106228-RadeonS...

[2] http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2012/...

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