[whatwg] Challenging canvas.supportsContext
bbenvie at mozilla.com
Wed Jun 19 14:20:40 PDT 2013
On 6/19/2013 2:05 PM, James Robinson wrote:
> What would a page using Modernizr (or other library) to feature detect
> WebGL do if the supportsContext('webgl') call succeeds but the later
> getContext('webgl') call fails?
I don't have an example, I was just explaining how Mozernizr is often used.
> I'm also failing to see the utility of the supportsContext() call.
> It's impossible for a browser to promise that
> supportsContext('webgl') implies that getContext('webgl') will succeed
> without doing all of the expensive work, so any correctly authored
> page will have to handle a getContext('webgl') failure anyway.
Given this, it would seem supportsContext is completely useless. The
whole purpose of a feature detection check is to detect if a feature
actually works or not. Accuracy is more important than cost.
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