Re: [csswg-drafts] Add a new media query feature: client-width and client-height, which equal to (viewport size - scrollbar size)

I didn't think of why the two features weren't added in the first place, after a thought today, I kind of understand the reason behind it.

May it be a consideration of a paradox? The paradox is:
If we don't do layout, how can we know if it overflows beforehand? If we don't know if it overflows beforehand, how can we know the client width/height used for layout?

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