Re: [whatwg/dom] Allow more characters in element/attribute names and prefixes (PR #1079)

@annevk commented on this pull request.

This does not seem equivalent to the sorta-EBNF from before. In particular if the first code point is from BeyondHTMLParserName the second code point was more limited.

>  
-<pre class=lang-ebnf>
-<dfn>ValidElementLocalName</dfn>         ::= <a>HTMLParserCompatibleName</a> | <a>BeyondHTMLParserName</a>
-
-<dfn>HTMLParserCompatibleName</dfn>      ::= [a-zA-Z] [^#x00#x09#x0A#0x0Cx0D#x20/>]*
-
-<dfn>BeyondHTMLParserName</dfn>          ::= <a>BeyondHTMLParserNameStartChar</a> (<a>BeyondHTMLParserNameChar</a>)*
-<dfn>BeyondHTMLParserNameStartChar</dfn> ::= ":" | "_" | [#x80-#x10FFFF]
-<dfn>BeyondHTMLParserNameChar</dfn>      ::= <a>BeyondHTMLParserNameStartChar</a> | [a-zA-Z] | "-" | "." | [0-9]
-</pre>
+* its [=string/length=] is at least 1;
+* its first [=code point=] is an [=ASCII alpha=], U+003A (:), U+005F (_), or in the range U+0080 to
+  U+10FFFF inclusive; and

comma before inclusive (cannot make code suggestions for some reason)

>  
-<pre class=lang-ebnf>
-<dfn>ValidElementLocalName</dfn>         ::= <a>HTMLParserCompatibleName</a> | <a>BeyondHTMLParserName</a>
-
-<dfn>HTMLParserCompatibleName</dfn>      ::= [a-zA-Z] [^#x00#x09#x0A#0x0Cx0D#x20/>]*
-
-<dfn>BeyondHTMLParserName</dfn>          ::= <a>BeyondHTMLParserNameStartChar</a> (<a>BeyondHTMLParserNameChar</a>)*
-<dfn>BeyondHTMLParserNameStartChar</dfn> ::= ":" | "_" | [#x80-#x10FFFF]
-<dfn>BeyondHTMLParserNameChar</dfn>      ::= <a>BeyondHTMLParserNameStartChar</a> | [a-zA-Z] | "-" | "." | [0-9]
-</pre>
+* its [=string/length=] is at least 1;
+* its first [=code point=] is an [=ASCII alpha=], U+003A (:), U+005F (_), or in the range U+0080 to
+  U+10FFFF inclusive; and
+* its subsequent [=code points=], if any, are not [=ASCII whitespace=], U+0000 NULL, U+002F (/), or
+  U+003E (>).

Should this be `<ul class=brief>`? I'd prefer we stick with `<p>`s and such for now, though I guess inline square brackets should be fine.

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