To have a better sense of the issues surrounding details / summary implementation
There have been recent discussions also Ability to style default summary in <details> #8770 https://github.com/whatwg/html/issues/8770 Details and summary styles don't match implementations. #8610 https://github.com/whatwg/html/issues/8610 Expand :open/:closed state to more elements #8884 https://github.com/whatwg/html/issues/8884
https://wpt.fyi/results/?label=master&label=experimental&aligned&view=subtest&q=details%20safari%3Afail https://wpt.fyi/results/html/rendering/the-details-element/summary-text-decoration.html?label=master&label=experimental&aligned&view=subtest&q=summary%20safari%3Afail
<rdar://problem/105707258>
Just wanted to mention that in iOS 15 and 16, the expanded or collapsed state of details/summary has stopped being announced to VoiceOver _at all_. This is mentioned in bug #257162 ("AX: iOS VO+Safari does not read <summary> role or state"). Some earlier (iOS 14 and earlier) bugs about expanded/collapsed state issues (like #230408) may need this fixed before they can be addressed. The expanded/collapsed state did used to get announced.