Re: [w3ctag/design-reviews] Beforematch event (#511)

Also from the same virtual face-to-face review. My main concern with the proposal is somewhat captured with [issue 150](https://github.com/WICG/display-locking/issues/150). The `beforematch` event opens the door for re-entrant code introducing easy to achieve circularity. The `beforematch` event fires >> the event handler removes the target DOM element >> another event handler handles the remove and adds it back to DOM >> etc. 

I appreciate that you're upfront listing the issues in your explainer however I didn't see good mitigation besides some ideas around scrolling specific logic. Can you provide more details as to how do you intend to stabilize this?

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