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This is a patch to fix bugs #975556 and #921657.
I think, it should be made just because the parser
should accept as many pages as it can. At the other
hand, the code near to fixed contains regexp to accept
mailformed attributes in other cases: compare attrfind
variable and locatestarttagend variable values.

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Missed patch, sorry ...

Heh, the patch applies cleanly to trunk more than four years later and
tests pass fine. We'll surely need better tests if the behavior change
is considered an improvement.

The patch is a one line change to a compiled regex. Would someone with html and/or regex knowledge like to comment, thanks, as I've no idea as to the implications. I also agree with comments in msg81692 regarding better unit tests. Please don't ask me! :)

I think this change is makes the parser far too lenient. Something like the explicit tolerant mode proposed in #1486713 is a better solution.

Included this in the 'strict=False' mode in the issue 1486713 patch.

this seems to eat too much into data and gets past endpos of the chunk processed, and parser gets confused and treats any subsequent stuff as data. i didn't think out how to fix the regexp as such, but instead limited its span to :endpos so it doesnot eat too much. 
seems to happen with unquoted attributes.

This issue is closed, so it's better if you create a new issue.
Even better if you can attach a patch that adds a testcase to Lib/test/test_htmlparser.py 

For the record, the new issue is #12008.