[whatwg] Video with MIME type application/octet-stream
bzbarsky at MIT.EDU
Tue Sep 7 14:13:58 PDT 2010
>> Of course nothing prevents us from saying UAs MUST NOT sniff but if they do
>> anyway they MUST use a given algorithm, right?
> That's a contrary to duty imperative, which is something that's been
> puzzling philosophers for centuries. A more sensible requirement
> would be that user agents SHOULD NOT sniff (for reasons XYZ), but, if
> they do, they MUST use a the following algorithm.
Except that in practice SHOULD NOT is treated as carte blanche to do the
undesirable thing. It has no teeth. MUST NOT doesn't much either, but
it's _something_ at least (in the sense that one can clearly claim that
violating a MUST NOT is a bug).
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