Re: [whatwg/dom] Add before removing steps (PR #1185)

An alternative idea: when https://html.spec.whatwg.org/#hide-popover-algorithm is invoked, instead of invoking https://html.spec.whatwg.org/#check-popover-validity from there, check only if https://html.spec.whatwg.org/#popover-visibility-state is "hidden" and if so return early.
Be aware that https://html.spec.whatwg.org/#popover-visibility-state is set to "hidden" only in https://html.spec.whatwg.org/#hide-popover-algorithm.

https://html.spec.whatwg.org/#dom-hidepopover would need to be extended to check whether the popover attribute is not present and throw in that case. Similar adaptations might be needed for other callers of https://html.spec.whatwg.org/#hide-popover-algorithm, but it might overall be a simpler solution than https://github.com/whatwg/dom/pull/1185#issuecomment-1579186990.

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