[whatwg] Challenging canvas.supportsContext

[Boris Zbarsky]

On 6/19/13 6:04 PM, Kenneth Russell wrote:
> supportsContext() can give a much more accurate answer than
> !!window.WebGLRenderingContext. I can only speak for Chromium, but in
> that browser, it can take into account factors such as whether the GPU
> sub-process was able to start, whether WebGL is blacklisted on the
> current card, whether WebGL is disabled on the current domain due to
> previous GPU resets, and whether WebGL initialization succeeded on any
> other page.

window.WebGLRenderingContext can take things like that into account too, 
in Gecko.  For what it's worth.

-Boris