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

>  
> -<p><dfn id="dfn-element-registration">Element registration</dfn> is a process of adding an <a>element definition</a> to a <a>registry</a>. One <a>element definition</a> can only be <a data-lt="element registration">registered</a> with one <a>registry</a>.</p>
> +<p>At the time of creation, a <a href="https://dom.spec.whatwg.org/#concept-document">document</a> could be associated with a <a>registry</a>. A <dfn id="dfn-registry">registry</dfn> is a <a href="https://en.wikipedia.org/wiki/Set_(computer_science)">set</a> of <a data-lt="custom element definition">custom element definitions</a>.</p>

Could be associated?  Shouldn't this be always the case?

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