[whatwg] WA1: <meta> attribute requirements

[fantasai]

HTML 4 #REQUIREs the 'content' attribute for <meta>. It does not
require 'name' probably only because the DTD can't express a
requirement of "either 'name' or 'http-equiv'": as WA1 notes, a
<meta> element without a 'name' attribute isn't defining any
meta data. Is there a reason why these attributes are nonetheless
all optional in WA1?

~fantasai