Re: [webcomponents] Large custom element spec rewrite to implement some F2F decisions (#405)

>  <ol>
> -    <li>Let <var>TYPE</var> be <em>typeExtension</em>, or <em>localName</em> if <em>typeExtension</em> is not present</li>
> -    <li>If an <a>element definition</a> with matching <em>localName</em>, <em>namespace</em>, and <var>TYPE</var> is <strong>not</strong> <a data-lt="element registration">registered</a> with <em>token</em>'s document, set <var>TYPE</var> to <em>localName</em></li>
> -    <li>Let <em>interface</em> be the <a href="https://dom.spec.whatwg.org/#concept-element-interface">element interface</a> for <var>TYPE</var> as <a href="https://dom.spec.whatwg.org/#concept-element-local-name">local name</a> and <em>namespace</em> (<a href="http://www.w3.org/1999/xhtml">HTML Namespace</a> for <a href="https://dom.spec.whatwg.org/#dom-document-createelement"><code>createElement</code></a>)</li>
> +    <li>If <var>localName</var> does not match the <a href="https://www.w3.org/TR/xml/#NT-Name"><code>Name</code></a> production, <a href="https://heycam.github.io/webidl/#dfn-throw">throw</a> an <code>InvalidCharacterError</code> exception.</li>

See #239.

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