Re: [whatwg/dom] Declarative Shadow DOM (#831)

For me, I think the "slot hoisting" is weird and/or counterintuitive. I also wonder what happens when I need 10x `<host-elements>` on the page. Do I provide 10x styles and and templates and slots?

Not to bikeshed too much, but I think lots of people would prefer auto-instantiating Custom Elements from a single template like...

```
<template customelement="host-element" shadowroot="open">
  <style>shadow styles</style>
  <h2>Shadow Content</h2>
  <slot></slot>
</template>

<host-element>
  <h2>Light Content</h2>
</host-element>
```

Then from a SSR authoring standpoint, I could `<?php include('host-element.php') ?>` once at the top of my document and author freely.

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