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

We looked at this again in our Gethen virtual f2f meeting.

While reducing the need for JS libraries and improving performance is definitely a goal we sympathize with, we are still concerned that this feature breaks one of the fundamental design principles of CSS, one that has been established for over twenty years. Breaking this assumption is not only confusing for authors, but has the potential to break tooling (e.g. WYSIWYG editors). While the new iteration reduces the cases where the side effects apply to when `content-visibility: auto` *also* applies, it is still introducing side effects and uninspectable state.

If side effects are truly the only way to solve this problem, have you explored solving the problem with a JS API instead? 

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