- From: Rik Cabanier <cabanier@gmail.com>
- Date: Wed, 12 Mar 2014 02:04:47 -0700
- To: "whatwg@whatwg.org" <whatwg@whatwg.org>
About a year ago, Google and mozilla proposed the "alpha" attribute as an option when you create the canvas context. The wiki explains the feature very well. [1] Since then, Google has implemented and shipped this [2][3]. There is a proposal to implement [4] and a patch [5] for firefox. An author can "feature test" by setting alpha to false and reading a pixel in the context. If the pixel comes back with an alpha of 0, it means that it is not supported. Could this be added to the HTML specification? [6] 1: http://wiki.whatwg.org/wiki/CanvasOpaque 2: http://crbug.com/234297 3: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/4KMwyiaOxHg 4: https://groups.google.com/forum/#!topic/mozilla.dev.platform/5i8H-xKGtEg 5: https://bugzilla.mozilla.org/show_bug.cgi?id=982480 6: http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-canvas-getcontext
Received on Wednesday, 12 March 2014 09:05:38 UTC