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In 12.2.2.5 "Preprocessing the input stream", the 4th para says: Any character that is a not a Unicode character, i.e. any isolated surrogates, is a parse error. Change "surrogates" to "surrogate", to match the rest of the sentence.
Checked in as WHATWG revision r8190. Check-in comment: Grammar in parser section http://html5.org/tools/web-apps-tracker?from=8189&to=8190