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Currently, the following doctypes are allowed in HTML5 in the parser: <!doctype html public"-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd"> <!doctype html system"about:legacy-compat"> However the syntax section requires a space between system and about:legacy-compat. Either the parser should change to require whitespace there, or the syntax section should not require it.
Checked in as WHATWG revision r3923. Check-in comment: Don't require a space between the word system and the system identifier. http://html5.org/tools/web-apps-tracker?from=3922&to=3923