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The following attributes exist in html4, but no in html5 specs: form.accept input.usemap a.name but they are not marked as obsolete in the diff document http://www.w3.org/TR/html5-diff/
https://github.com/whatwg/html-differences/commit/1f8778b1e26d98ae1de62ca7e99201c1d90a6a44