Re: [w3c/webcomponents] Proposal: Allow custom elements to be in any namespace (#634)

Hmm is this the proposal that would also make `is` work for `class SvgIcon extends SVGElement `?
```js
      import {html, render} from 'https://unpkg.com/lit-html?module'
      import SvgIcon from './SvgIcon.js'
      customElements.define('svg-icon', SvgIcon, {extends: 'svg'})
      render(html`
        <svg is="svg-icon" viewBox="0 0 75 75" icon="add"></svg-icon>
        `, document.body)
```

Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry': "svg" is an HTMLUnknownElement

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