Re: [w3ctag/design-reviews] Layout Instability Shifted Element Surfacing (#485)

So we looked at this briefly in our Breakout B today.

A few thoughts:

* How long lived are these `LayoutShift` performance entries going to be?  Is there a risk that they'll (via the `LayoutShiftAttribution`) entrain a bunch of dom nodes that would otherwise be garbage and cause memory leaks?  (And would this happen on all pages, or just those that invoke certain things?)

* In general, a lot of this feels like trying things to figure out what metrics are going to be useful for sites to figure out their performance problems.  It's... hard for us as the TAG to guess what's going to be useful here, other to say it would be great if the end result is that the successful experiments end up baked into the web platform and the unsuccessful ones don't.

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