Re: [WICG/webcomponents] Addressable comments (a very small DOM parts subset) (Issue #1116)

sorvell left a comment (WICG/webcomponents#1116)

I want to mostly echo https://github.com/WICG/webcomponents/issues/1116#issuecomment-3525964584. It's a nice advancement if we can have a performance win by avoiding the tree walk. Just to be clear, it has to be faster than something like:

```js
function collectComments(root: Node = document): Comment[] {
  const walker = document.createTreeWalker(root, NodeFilter.SHOW_COMMENT);
  const comments: Comment[] = [];
  let node: Comment | null;
  while (node = walker.nextNode() as Comment | null) comments.push(node);
  return comments;
}
```

Other than that...

- I think it's possible easily to extract any attribute/event/property info into a comment that's say the first child of an element. 
- Supporting ranges in text only elements (mostly style) would be really great as well, and putting the comment *after* the entire element makes parsing the input trickier.

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