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I want to suggest to you a feature to make Validator services to be able to fix HTML page. An errors HTML page after validated with w3.org can be redirect to a HTML fixing page. That page can fix all error HTML.
I'm afraid such a thing would not be really possible. There is however a "Clean up Markup with HTML Tidy" option already which does a fair deal of cleanup which may cover a subset of what you're looking for.