Re: [whatwg/dom] Introduce `moveBefore()` state-preserving atomic move API (PR #1307)

I wonder if that choice of error tolerance could be moved to a boolean argument. Like, `parent.moveBefore(child, refNode, true)` to tolerate failure to move (like a missing custom element move callback) and `parent.moveBefore(child, refNode, false)` to throw on failure, or vice versa. That could be an acceptable compromise.

Also, how does this handle the case of `parent` and `child` having different `Document`s? If I'm understanding correctly, an exception is thrown, but that's just a guess that checking "shadow-including root" equality implies that.

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