Re: [webcomponents] Type extensions in SVG use shadow trees--specify, or add a note if no specification is necessary (#335)

Elsewhere we decided that this doesn't work for now. All custom elements are HTML elements. Shadow roots can only be attached to a select few HTML elements (including custom elements).

We might extend the HTML parser so HTML custom elements can be used inside SVG.

How SVG `use` works is up to the SVG WG to define. They can easily make use of a closed shadow root to describe it.

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