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

>  
>  <pre class='idl'>
>  partial interface Document {
> -    Function registerElement(DOMString type, optional ElementRegistrationOptions options);
> +    Function defineElement(DOMString type, Function constructor, optional ElementRegistrationOptions options);

defineElement should have "void" as the return type.

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