Re: [whatwg/dom] Hook for SVG and HTML script element insertion (#575)

With the following example I still get a `slotchange` event. I think that means that kind of tracking should happen before script execution, similar to queuing the mutation record.
```html
<div id=host></div>
<script>
const host = document.getElementById("host"),
      shadow = host.attachShadow({ mode: "closed" }),
      slot = shadow.appendChild(document.createElement("slot")),
      df = document.createDocumentFragment(),
      s1 = df.appendChild(document.createElement("script")),
      s2 = df.appendChild(document.createElement("script"));

slot.addEventListener("slotchange", e => console.log(e));
s1.textContent = "df.appendChild(s1); df.appendChild(s2);";
s2.textContent = "console.log('hmm');";
host.appendChild(df);
</script>
```

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