[whatwg] The problems with namespaces in text/html

[Bjoern Hoehrmann]

* Elliotte Harold wrote:
>Really? Never? There are many HTML 4 documents that are well-formed XML 
>documents? Are these not legal HTML 5 documents? I scanned the spec 
>quickly, but I didn't find anything that was flat out forbidden by XML. 

For a document to be a HTML 4 document it would need a HTML 4.01
document type declaration, and for a document to be a well-formed
XML document, it would have to have no HTML 4.01 document type
declaration. There are not many documents that both have and don't
have a HTML 4.01 document type declaration. Remember that the DTD
needs to match the production for external subsets.
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