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On 18/05/2011 20:06, Jesper Tverskov wrote: > For years and implemented all over the place, we > have been used to get the validation we expect in one step but what validation do you expect? validating a document served at text/html as xhtml (or xml generally) is not (and was never) a good idea as it will not be parsed as XML by any relevant user agent, so using xml to validate it is misleading at best. html5 changes the rules to make it _possible_ to serve well formed xml as html for the first time. using HTML4 and XHTML 1, then a document that is syntactically xhtml, if served as html is basically just html full of syntax errors that only worked at all because the browsers did not parse html as specified, and because they don't report syntax errors. Personally I'd have pushed to go further (and make more uses of xml empty syntax conforming) but already, html5 goes a long way beyond html4/xhtml1 in allowing people to serve well formed xml as text/html. David
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