[whatwg] [canvas] Proposal for supportsContext

Simon Pieters simonp at opera.com
Tue Sep 11 01:34:09 PDT 2012

On Tue, 11 Sep 2012 00:14:25 +0200, Glenn Maynard <glenn at zewt.org> wrote:

> Expecting pages to use a supportsContext API is still expecting pages to
> behave nicely.
> If you really want to protect users from the behavior of pages, you'd
> really need to make creating the context cheap.

This was exactly my reaction as well. Introducing a new method doesn't  
solve the problem. There will still be pages that create the context and  
then don't use it. Browsers just have to suck it up and be fast anyway,  
just like with all other features on the Web.

I think we shouldn't add supportsContext() since it doesn't provide  
authors with new information and browsers will have to do the above anyway.

Simon Pieters
Opera Software

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