Bug 314330

Summary: Books using excessive `column-count: 1` break
Product: WebKit Reporter: fantasai <fantasai.bugs>
Component: Layout and RenderingAssignee: fantasai <fantasai.bugs>
Status: RESOLVED FIXED    
Severity: Normal CC: bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: WebKit Local Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on: 299836    
Bug Blocks:    
Attachments:
Description Flags
simplified testcase from the radar none

fantasai
Reported 2026-05-07 11:02:25 PDT
From rdar://171766396 there seems to be a fair amount of content that regressed from bug 299836 because it's assuming `column-count: 1` doesn't create a multi-column box, and our multicol implementation can't handle nested fragmentation very well. (One book specified `column-count: 1` on *, even. T_T) Ideally we fix the multicol layout issues that are causing problems and/or patch the books, but in the meantime it seems like we need to revert the fix for bug 299836.
Attachments
simplified testcase from the radar (2.77 KB, application/epub+zip)
2026-05-07 16:12 PDT, fantasai 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
fantasai
Comment 1 2026-05-07 11:15:38 PDT
<rdar://problem/171766396>
fantasai
Comment 2 2026-05-07 11:16:49 PDT
Pull request: https://github.com/WebKit/WebKit/pull/64481
fantasai
Comment 3 2026-05-07 16:12:09 PDT
Created attachment 479525 [details] simplified testcase from the radar
fantasai
Comment 4 2026-05-07 16:15:32 PDT
Pull request: https://github.com/WebKit/WebKit/pull/64507
EWS
Comment 5 2026-05-12 16:39:27 PDT
Committed 313114@main (d97b21bef909): <https://commits.webkit.org/313114@main> Reviewed commits have been landed. Closing PR #64507 and removing active labels.
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