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[Bug 11431] should mention that .toDataURL() for image/jpeg acts as if the image was composited against black

From: <bugzilla@jessica.w3.org>
Date: Tue, 30 Nov 2010 11:16:06 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1PNOBq-0008W8-5l@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=11431

--- Comment #2 from Philip Taylor <excors@gmail.com> 2010-11-30 11:16:05 UTC ---
The spec already says:

  "For image types that do not support an alpha channel, the image must be
composited onto a solid black background using the source-over operator, and
the resulting image must be the one used to create the data: URL."

so I think it's clear on what's required (which is what that test tests).

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