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

@annevk approved this pull request.

Thanks, this looks accurate to me.

> +
+ <li><p>Return true.
+</ol>
+
+<p class=note>This concept is used to validate [=/element=] [=Element/local names=], when
+constructed by DOM APIs. The intention is to allow any name that is possible to construct using the
+HTML parser (the branch where the first [=code point=] is an [=ASCII alpha=]), plus some additional
+possibilities. For those additional possibilities, the ASCII range is restricted for historical
+reasons, but beyond ASCII anything is allowed.
+
+<div class=note>
+ <p>The following JavaScript-compatible regular expression is an implementation of the above
+ definition:
+
+ <pre class=lang-javascript>
+  /^(?:[A-Za-z][^\0\t\n\f\r\u0020/>]*)|(?:[:_\u0080-][A-Za-z-.:_\u0080-]*)$/u

@zcorpan or @mathiasbynens could you please review this?

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