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Spec says: ]] In other words, <!DOCTYPE HTML>, case-insensitively. [[ Proposal: Use 'html' instead of 'HTML': ]] In other words, <!DOCTYPE html>, case-insensitively. [[ And add that when used for XHTML, then the DOCTYPE is a case-_sensitive_ match of the string '<!DOCTYPE html>'. The proposal was suggested by Maciej in April (which I then unwisely rejected): http://lists.w3.org/Archives/Public/public-html/2010Apr/1199 Motivation 1: Make more people (unknowingly) do it right when they try to be XHTML-compaptible/polyglot. Motivation 2: According to Sam, HTML5 "lowercases element and non-namespaced attribute names" http://intertwingly.net/slides/2010/ws-rest/html5-15 Thus it should be more consistent to lowerase the 'html' string.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: see diff given below Rationale: Sure, we can do that.
Checked in as WHATWG revision r5570. Check-in comment: vaguely push people towards a polyglot-compatible doctype http://html5.org/tools/web-apps-tracker?from=5569&to=5570