Re: [csswg-drafts] [css-contain] ruby container missing from size containment exclusions (#11304)

I think it's perfectly fine to apply size containment to `display: block ruby`, affecting the wrapper (principal box).

And `display: ruby` should be covered by

> if its [principal box](https://drafts.csswg.org/css-display-4/#principal-box) is [...] a [non-atomic](https://drafts.csswg.org/css-display-3/#atomic-inline) [inline-level](https://drafts.csswg.org/css-display-3/#inline-level) box

https://www.w3.org/TR/css-ruby-1/#formatting-context

> [Ruby containers](https://www.w3.org/TR/css-ruby-1/#ruby-container) are non-atomic [inline-level](https://www.w3.org/TR/css-display-3/#inline-level) boxes

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Received on Thursday, 11 September 2025 21:47:56 UTC