Hi, In the DOCTYPE name state[1], Anything else, the spec currently says:
If the name of the DOCTYPE token is exactly the four letters "HTML", or exactly the four letters "html", then mark the token as being correct.
I think that ["H"|"h","T"|"t","M"|"m","L"|"l"] should be correct. I browsers I'm aware of that do doctype switching will use their standards mode for all case combinations.
[1] http://www.whatwg.org/specs/web-apps/current-work/#doctype0 Regards Simon Pieters
