It's not the question of "well-formedness" but the difference between HTML and XHTML. XHTML must comply to XML formatting rules (for example, self-closing tags) because it is essentially XML with HTML namespace (as default), HTML has no such requirement, but is "backward" compatible with XHTML in that it allows self-closing tags.
There is also difference how special namespaces are handled between both, that's why there are currently issues (if you observe it from the standpoint of a purist validator) with OpenGraph namespaces and HTML+RDF, etc...
HTML5 also allows custom tag attributes which is awesome and you don't need complex XML namespacing schemes for that.
.oO V Oo. On 12/18/2011 01:01 PM, Christoph Zwerschke wrote:
The point is that HTML5 doesn't require well-formedness as XHTML did. Of course creating well-formed output is still the goal, but it has become a less crucial issue as it was in XHTML.
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