Re: [w3ctag/design-reviews] Layout Instability Metric (#393)

> So it seems to me it is in fact introducing something that is not possible today (it might be possible, maybe, with different approach, less efficiently, etc?) after all. Why not document this down?

I think it probably is possible today by more directly observing the things that cause the layout instability:  put a bunch of load events on images and fonts, record the times from them, also record the times from any key points in script execution that would modify the layout, etc.  This would more directly record the performance measurements than the layout instability score, which would really be a lower-information proxy for those other things.

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