Repeal autocomplete form attribute being boolean

[marek-saji]

autocomplete attribute may have string values:
http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#attr-fe-autocomplete

[malukenho]

@marek-saji please rebase this PR!

[adamlundrigan]

@weierophinney what do you think? Is it sufficient to just treat autocomplete as a freeform string attribute? The spec is very specific about what the autocomplete attribute can contain (see link from OP)...is that something we should try to validate? Seems to me like a lot of complexity for little gain...

[Ocramius]

@marek-saji I manually merged this PR into develop at a2eaf84

[adamlundrigan]

From what I've read, this depends on what version of the HTML5 spec you're following. If you refer to the W3C's HTML5 spec (October 28th 2014) it says that autocomplete has only two values, on and off. The WHATWG spec you've linked to is a "living" HTML5 spec, which more closely aligns with W3C's HTML 5.1 working draft, both of which go into much greater detail about what is allowed and where w.r.t autocomplete.