Re: [WICG/webcomponents] The way to access current script or current root, from Shadow DOM (#717)

I came up with [a solution](https://stackoverflow.com/a/72242132/6036546) to this problem. I used a custom element in the linked example but it's not necessary. It can also work from outside of a closed shadowRoot with a few tweaks like this :

```
<div id="test"></div>
<script type="module">
  const host = document.querySelector('#test');
  const shadowRoot = host.attachShadow({ mode:'closed' });
  const scopedEval = (script,scope) => Function(script).bind(scope)();
  shadowRoot.innerHTML = `<script>console.log(this, this.host);<\/script>`;
  const scripts = shadowRoot.querySelectorAll('script');
  scripts.forEach(s => scopedEval(s.innerHTML, shadowRoot));
</script>
```

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