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

I also tested custom elements:
```html
<script>
customElements.define("ce-1", class CE1 extends HTMLElement {
  constructor() {
    super();
  }
  connectedCallback() {
    console.log("ce-1 connected");
  }
});

const df = document.createDocumentFragment(),
      s = df.appendChild(document.createElement("script")),
      ce1 = df.appendChild(document.createElement("ce-1"));
s.textContent = "df.appendChild(ce1);";
document.head.appendChild(df);
</script>
```
This logs "ce-1 connected" in Chrome and Firefox. It doesn't log anything in Safari. I'm inclined to side with Chrome and Firefox here.

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