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

@prlbr yes, but there are enough tricky questions about how this should be behave that it seems like we should see more user-space solution uptake in the wild. There's not so much that the browser can do here that can't be done with a very small script and `<template>`. I think if someone vended a library for this and it got uptake it might have a better chance of a comeback.

The code should be very simple, something along the lines of:

```js
for (const template of document.querySelectorAll('template[shadowroot]')) {
  try {
    const mode = template.getAttribute('shadowroot');
    const root = template.parentElement.attachShadow({mode});
    template.remove();
    root.appendChild(document.adoptNode(template.content);
  } catch (e) {
    console.error(e);
  }
}
```

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