OpenSP is already non-conformant to HTML5. See:
http://whatwg.org/specs/web-apps/current-work/#conformance
Actually I believe OpenSP is just the parser, and the validator is the conformance checker which uses OpenSP. Thus, OpenSP is not non-conformant according to that, but the validator is. However, I disagree with that statement anyway. Validators should not be non-conformant simply because they only do their job to validate a document and nothing else. I don't see any reason why such a statement needs to be included at all.
If OpenSP was non-conformant, then any current or future UA that is built with OpenSP as the parser would be non-conformant also, which should not be the case. Since HTML is, and IMHO should remain, an application of SGML, the use of a conformant SGML parser should not make the user agent non-conformant.
In any case, assuming I'm still the editor when the parsing section gets written,
Why wouldn't you be?
HTML5 will most likely stop the pretense of HTML being an SGML application.
What the? I disagree with that. HTML should remain an application of SGML, and browser's should be built to conform properly. Aside from the unimplemented SHORTTAG features (which can be turned off in the DTD anyway) and the mostly undefined error handling, what about HTML 5 will be so incompatible with SGML to warrant such a decision?
Also, while on the topic of handling invalid documents, is this spec going to attempt to address the <x><y></x></y> problem?
Probably not, as there is no generally accepted solution. In fact there is no known solution (to my knowledge) that is entirely satisfactory.
Agreed, since no existing browser I know of handles it in the most logical and, IMHO, the most correct way (ie. when a parent element is closed, all unclosed children elements should be closed and not reopened after); and no two browsers that I know of create completely compatible DOMs with any other method.
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