The Height Enigma

T2Covered by 1 source · first reported by Martin Fowler / Overreacted / Kent C. Dodds / Josh Comeau at 12 May 2025, 11:30 UTC

One of the most perplexing and befuddling things in CSS for me, for many years, was the behaviour of percentage-based heights. Sometimes, seemingly at random, setting height: 100% would have no effect at all. When I finally figured out what was going on, it was like a puzzle piece snapping into…