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'HMTL' should be 'HTML'; two instances
this typo has been fixed in the development version of the validator, which we need to push into production soon (hopefully). http://qa-dev.w3.org/wmvs/HEAD/ Thank you.
*** Bug 5828 has been marked as a duplicate of this bug. ***
Not just a typo, the explanation is completely wrong! Read the Bug 5828 report for explanation.