[whatwg] HTML 5 buttons and constraint validation

[Alex Vincent]

There's a possible disconnect between <input type="button"/> and
<button/>.  The former is barred from constraint validation, but the
latter is not.  (Section 4.10).  Is this intentional?

-- 
"The first step in confirming there is a bug in someone else's work is
confirming there are no bugs in your own."
-- Alexander J. Vincent, June 30, 2001