Re: [whatwg/dom] Run insertion steps after DocumentFragment insertion completes (#576)

Except in Edge, `style.sheet` initialization is queued similar to scripts. I.e., the following logs null in the Live DOM Viewer:
```html
<script>
 var s1 = document.createElement("style"); s1.textContent = "body { background:lime }";
 var s2 = document.createElement("script"); s2.textContent = "w(s1.sheet)";
 var df = document.createDocumentFragment(); df.appendChild(s2); df.appendChild(s1);
 document.head.appendChild(df);
</script>
```

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