[whatwg] on codecs in a 'video' tag.

[Bjoern Hoehrmann]

* Anne van Kesteren wrote:
>Also, I think the HTML specification should mandate (as SHOULD-level  
>requirement, probably) support for the various supported image formats as  
>it gives a clear indication of what authors can rely on and what user  
>agents have to implement in order to support the web.

And you think this should be in the "HTML specification" rather than
some dedicated technologies-that-should-be-implemented-by-visual-desk-
top-browsers specification why exactly? Such a "SHOULD" would not apply
to many "HTML implementations" and not easy to specify (you do not want
to require full JPEG support, for example, and an authoring tool might
not support GIF), so you have a SHOULD with many exceptions, decreasing
the normative force of all other SHOULD-level requirements.
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