Re: [whatwg/dom] Declarative Shadow DOM (#510)

If I understand well, the reason this will not be implemented is because the `<template>` element caused such disruption in parsers, that it can still cause bugs here and there. So a new element is not considered a sane proposal.

Then why not keep the `<template>` tag and introduce ways to bind the DOM of a template as a shadow DOM of another element. It can also help deduplicate shadow DOM trees too. Something like this:

```html
<div shadowdom="hello">World</div>

<template id="hello" shadowmode="open">
Hello <slot></slot>
</template>
```

The `shadowdom` attrigute references the id of a matching template. The `shadowmode` attribute is inspired from https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Declarative-Custom-Elements-Strawman.md

This has also the advantage of not requiring disappearing elements, or self modifying markup.

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