[whatwg/dom] Interface NodeFilter - return values need a new option. (#1005)

https://dom.spec.whatwg.org/commit-snapshots/f2a2dedd8831cbae9afeab87b915e1234c49cba1/#interface-nodefilter

> Interface NodeFilter

According to the current standard, the filter return values can be

- FILTER_ACCEPT (1);
- FILTER_REJECT (2);
- FILTER_SKIP (3).

I propose a fourth:

FILTER_ABORT (4)

If the filter implementor can detect that the traverse has reached an end point, it should be possible to terminate the traverse early.

It's possible to `throw` right now and most implementations seem to silently terminate the traverse, but that's not a good solution I feel.

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