The new quick introduction includes: Attributes are placed inside the start tag, and consist of a name and a value, separated by an "=" character. The attribute value can be left unquoted if it is a keyword, but generally will be quoted.
-- http://www.whatwg.org/html5#a-quick-introduction-to-html "Generally will be" seems to be a prediction that the spec doesn't need to make, and could be seen as a recommendation for authors to quote attributes even when they're unnecessary. Could we simply omit that (finishing the sentence at "keyword")? Smylers