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concept-node-insert needs a new step at the end as a hook for HTML. It can then execute scripts, and do other things based on that as a starting point for when the elements are actually inserted. That would also make DocumentFragment insertion clearly atomic. Probably need an equivalent for removed (e.g. <meta http-equiv=refresh> or <iframe>) and also make sure replace happens sanely.
https://bitbucket.org/ms2ger/dom-core/changeset/54c5c233b4ad