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RE: Proposal for <canvas src> to allow images with structured fallback by Tab Atkins Jr.

From: Sean Hayes <Sean.Hayes@microsoft.com>
Date: Mon, 7 Mar 2011 16:35:28 +0000
To: Steve Faulkner <faulkner.steve@gmail.com>, HTML WG LIST <public-html@w3.org>
CC: HTML Accessibility Task Force <public-html-a11y@w3.org>, "jackalmage@gmail.com" <jackalmage@gmail.com>
Message-ID: <8DEFC0D8B72E054E97DC307774FE4B913FAA61E3@DB3EX14MBXC301.europe.corp.microsoft.com>
Fallback content is used when the user agent is unable to present the content (because it doesn't implement the required feature), which for the <video> feature for example may mean a plugin using the same modality of presentation (moving image).

Alternative content is linked to (in the case of <video> using the <track> element and not included within the <video> construct), it is used where the UA is perfectly capable of presenting the content (audio/video), but where that modality of presentation is not useful for the user. 

Not that I'm particularly pro or con the proposal, just pointing out that these are conceptually different things, and treating them as the same may lead to issues if both concepts are not dealt with adequately.
Received on Monday, 7 March 2011 16:37:06 UTC

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