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

@domfarolino commented on this pull request.



> + <li><p>Let <var>return node</var> be the result of <a>pre-inserting</a> <var>node</var> into
+ <a>this</a> before <var>child</var>.</p></li>

Yeah I think initially I saw it as a separate primitive too, but the more I looked at it, the more the difference between the two seemed really subtle. It mostly has to do with MutationObservers (and half of the relevant logic here is tucked away in the "remove" primitive) and *not* running the post-connection steps. So I feel like we'd end up with a near line-by-line copy of "insert", modulo one or two small differences. I'll take another look to see if my intuition is accurate, but I do kinda suspect this is where we'd end up.

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