213348 2020-06-18 13:09:48 -0700 <details> ignores box-sizing: inherit 2023-02-13 18:51:59 -0800 1 1 1 Unclassified WebKit CSS Safari 13 Mac macOS 10.15 NEW InRadar P2 Normal --- 252223 1 bouke webkit-unassigned ahmad.saleem792 ap bfulgham bouke simon.fraser webkit-bug-importer zalan oldest_to_newest 1663969 0 bouke 2020-06-18 13:09:48 -0700 Given this CSS: body { box-sizing: border-box } * { box-sizing: inherit } And given the following CSS: <details> <summary>System Information</summary> <p>macOS</p> </details> Expected behaviour: The expected box-sizing of the <summary> and <p> elements is border-box. Actual behaviour: The box-sizing property is content-box for both. 1664644 1 webkit-bug-importer 2020-06-19 17:29:04 -0700 <rdar://problem/64550428> 1902501 2 ahmad.saleem792 2022-09-30 15:40:54 -0700 I changed the test case into following JSFiddle (just added HTML part in body tag): Link - https://jsfiddle.net/h1k9f8sq/ In above, if I use inspector to see result of both, the computed value is "content-box" for both in Safari 16 but it is same case in Chrome Canary 108. Am I testing it wrong or this has changed? Appreciate if someone can comment. Thanks!