Re: [whatwg/dom] Proposal: ParentNode.empty() (#478)

@domenic, understood. Thank you.

You’ve indicated I do not have an example for emptying documents.

I’ve only needed to empty iframe documents.

```js
iframe.contentDocument.empty()
```

Being fully transparent, I only do this for creating “clean” shadow-dom-like fallbacks. And, admittedly, I see people using strings (via srcdoc) for this as well: https://codepen.io/chriscoyier/pen/rwvjVN

Perhaps it’s old instincts, but I really thought `target.innerHTML = ''` uses the HTML parser on `target`. I was also under the impression (from the Stack Overflow reference above regarding emptying a node with innerHTML) that this is much slower and should be avoided. My apologies if I’ve misunderstood this technology — it was not my intention.

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