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Mozilla is considering implementing a new input field for MM-DD data (no year): https://bugzilla.mozilla.org/show_bug.cgi?id=974341 See also: http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2010-August/027725.html bug 15114 - type=datetime for when you don't know what the user wants to omit bug 25315 - type=year
There's little appetite for new controls at this point. Let's turn custom elements into a success first.