Can you reason out the difference between a selector doing :has(:not) vs :not(:has)? Kilian Valkhof wrote up that post I just linked to. I like how he teaches the way to think it out is to write out all the implied selectors at work. For instance: .card:has(:not(img)) {} .card:not(:has(img)) {} is really: .card:has(*:not(img)) {} .card:not(.card:has(img))…

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Advanced CSS selector patterns and modern features are explored through practical examples. The difference between :has(:not) and :not(:has) selectors is clarified by expanding implied selectors. Range syntax for style queries enables conditional styling based on custom property values, though with limitations when querying the same element. The box-decoration-break property solves visual issues with wrapped inline elements. Modern CSS units can be combined using functions like min() and round() for more flexible spacing systems.

Chris’ Corner: Lovingly Esoteric CSS