meta name comparison should be explicitly ASCII case-insensitive

[domenic]

https://html.spec.whatwg.org/multipage/semantics.html#standard-metadata-names

It says at the top

Names are case-insensitive, and must be compared in an ASCII case-insensitive manner.

but later in some processing models it says

• has its name attribute set to the value application-name
• whose name attribute's value is keywords
• The element has a name attribute, whose value is referrer
• The element has a name attribute, whose value is theme-color

These three instances should be changed to "value is an ASCII case-insensitive match for X", with "ASCII case-insensitive" appropriately linked. Otherwise, they currently indicate something contradictory to the opening paragraph.

[annevk]

(I think it would be even better if we had some kind of name concept indirection that either returned an ASCII lowercased string or null if there's no name attribute.)

[domenic]

I mean I was thinking of going further and abstracting out the whole predicate of step 1 of https://html.spec.whatwg.org/multipage/semantics.html#meta-referrer (with the "in head" check optional) and trying to use it more uniformly throughout the section. E.g. keywords and application-name use a loose variant of that, whereas theme-color uses something similar to that... all kind of a mess.

But for now, just this quick fix will suffice.