Re: [whatwg/dom] Proposal: DOMChangeList (#270)

```webidl
interface DOMTreeConstruction {
  unsigned long openElement(DOMString name, NamespacePrefix = "html");
  void closeElement();

  void setAttribute(DOMString name, optional DOMString value = "", optional NamespacePrefix = "");
  unsigned long appendText(DOMString text);
  unsigned long appendComment(DOMString text);
  Bounds appendHTML(DOMString html);
};
enum NamespacePrefix { "", "html", ... };
```
(Maybe `unsigned long long`?)

Spoofing does not matter. That would simply result in an error when the "C++ side" uses the instruction set to create a tree. And since we cannot support rollback and proper transactions anyway due to `<iframe>`, that doesn't seem like a problem. Or at least not one we can solve.

I'm not entirely sure what you're saying. The cost to create a promise or a node is equal to creating a number?

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