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

@annevk commented on this pull request.



> @@ -13,12 +13,12 @@ Indent: 1
 
 <pre class=anchors>
 urlPrefix: https://www.w3.org/TR/xml/#NT-

Should we add `spec: XML` while here?

> @@ -177,19 +177,59 @@ first <a>following</a> <a for=tree>sibling</a> or null if it has no <a for=tree>
 added.
 
 
-<h3 id=namespaces>Namespaces</h3>
+<h3 id=name-validation oldids=namespaces>Name validation</h3>

I'd prefer just living with historical artifacts like that and not touching blame for them.

> + <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-\u{10FFFF}][A-Za-z0-9-.:_\u0080-\u{10FFFF}]*)$/u
+ </pre>

Should this be `<pre><code class=lang-javascript>`?

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