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Re: LONGDESC: some current problems and a proposed solution added to the wiki

From: Geoffrey Sneddon <foolistbar@googlemail.com>
Date: Sat, 30 Jun 2007 17:05:10 +0100
Message-Id: <013A757E-A42D-419B-8632-869185C78FF6@googlemail.com>
Cc: public-html@w3.org
To: Ben Boyle <benjamins.boyle@gmail.com>

On 30 Jun 2007, at 16:50, Ben Boyle wrote:

> I apologise for not "making a use case" at this point. I look forward
> to producing some soon. For now I want to let you ponder why we
> propose different fallback mechanisms...
> - nothing for embed
> - text only (@alt) for img
> - HTML for video, audio, object

Simply: backwards-compatibility. |embed| could have an attribute  
added to it (but its content model can't be changed without breaking  
all current UAs). |img| similarly can't have its content model  
changed. The rest of the elements can have such things in backwards  
compatible ways (|video| and |audio| due to HTML's handling of  
unknown elements, and |object| because it is already implemented in  
that way).

- Geoffrey Sneddon
Received on Saturday, 30 June 2007 16:05:17 UTC

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