[whatwg] canvas context "alpha" attribute
cabanier at gmail.com
Wed Mar 12 02:04:47 PDT 2014
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. 
Since then, Google has implemented and shipped this . There is a
proposal to implement  and a patch  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? 
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