Re: [w3ctag/design-reviews] CSS: contain-intrinsic-size: auto, and converting to a shorthand property (#624)

@cbiesinger, thank you for taking the time to reevaluate your proposal and other options. I agree that correlating with UA/scrollbar behavior is the right way to reason about this feature. With that in mind, the overall benefit to users in terms of perf/power savings is potentially significant thus I support it. The downside of the feature is that users can experience "popping" of layout as content loads and sizes changes from `remembered` to something else. This is not great but reality is that users are conditioned to largely ignore that today due to infinite scrollers and content being loaded based on scrolling.

One questions I couldn't answer myself is what is the affect to transitions and animations. The current spec behavior defines `computed` value as the starting point, which is the `initial` value and not the `remembered` value. Wouldn't this introduce a lot of discontinuity? Do you have any implementation experience that could suggest how glitchy are these?

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