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http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#rel-icon spec says: — If the "shortcut" keyword is present, it must be come immediately before the icon keyword and the two keywords must be separated by only a single U+0020 SPACE character. Consider changing it instead to just say that that if the "shortcut" keyword is specified, the next keyword must be "icon".
Please ignore the description and instead see Simon's suggestion at http://krijnhoetmer.nl/irc-logs/whatwg/20140326#l-310 It seems like it'd make more sense to just require that if the entire value of the rel attribute be "shortcut icon", case-insensitive. Because I think if there's anything else in the value, it's not going to work as expected in IE anyway. (Also because in the general shortcut-icon case, it doesn't make sense anyway for the the value to contain anything more.)
see also https://www.w3.org/Bugs/Public/show_bug.cgi?id=12695
Done, but the edit is gated behind another that I didn't realise I'd started. Should be r8556 when it gets checked in.
http://html5.org/tools/web-apps-tracker?from=8557&to=8558