Bug 277573

Summary: REGRESSION (Safari 18): details/summary with content-visibility:auto doesn't expand
Product: WebKit Reporter: Bogdan Brinza <bogdan.brinza>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Major CC: karlcow, koivisto, mike, rniwa, webkit-bug-importer
Priority: P2 Keywords: BrowserCompat, InRadar
Version: Safari 18   
Hardware: Mac (Apple Silicon)   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 252223    
Attachments:
Description Flags
Minimal repro none

Description Bogdan Brinza 2024-08-02 16:39:19 PDT
Created attachment 472049 [details]
Minimal repro

Noticed that in Safari 18 beta 1-3 on macOS 14.6 (23G80).

See the attached repro - when details element has content-visibility: auto - you cannot expand summary to see details. Works in Firefox, Chrome and worked in Safari 17. You can make details visible with Dev Tools if you force style invalidation (e.g. toggle some property).

By the way, Safari 18 is missing from Feedback Assistant, only 16 and 17 are present.
Comment 1 Radar WebKit Bug Importer 2024-08-05 16:31:24 PDT
<rdar://problem/133251469>