RESOLVED FIXED301873
REGRESSION (300911@main): Card layout on archidekt.com is incorrect 
https://bugs.webkit.org/show_bug.cgi?id=301873
Summary REGRESSION (300911@main): Card layout on archidekt.com is incorrect
Simon Fraser (smfr)
Reported 2025-11-03 11:09:59 PST
Created attachment 477265 [details] Screenshot Load https://archidekt.com/decks/17173061/calamity_galloping_inferno and note how the cards don't stack correctly like they do in older builds, or on other browsers. <rdar://163605539>
Attachments
Screenshot (9.98 MB, image/png)
2025-11-03 11:09 PST, Simon Fraser (smfr) 		no flags
Details
Reduced test case (1.03 KB, text/html)
2025-11-05 12:40 PST, Sam Weinig 		no flags
Details
Screenshot of reduction (shipping) (525.37 KB, image/png)
2025-11-05 12:43 PST, Sam Weinig 		no flags
Details
Screenshot of reduction (ToT) (507.27 KB, image/png)
2025-11-05 12:43 PST, Sam Weinig 		no flags
Details
Reduced test case (772 bytes, text/html)
2025-11-05 12:50 PST, Sam Weinig 		no flags
Details
Reduced test case (686 bytes, text/html)
2025-11-05 12:53 PST, Sam Weinig 		no flags
Details
Show Obsolete (2) View All Add attachment proposed patch, testcase, etc.
Simon Fraser (smfr)
Comment 1 2025-11-03 11:17:51 PST
Looks like it's about: .imageStack_cardStack__IFA_m > div:not(:first-child) { margin-top: calc(-125% - 25px); }
Sam Weinig
Comment 2 2025-11-05 12:40:40 PST
Created attachment 477310 [details] Reduced test case
Sam Weinig
Comment 3 2025-11-05 12:43:13 PST
Created attachment 477311 [details] Screenshot of reduction (shipping)
Sam Weinig
Comment 4 2025-11-05 12:43:31 PST
Created attachment 477312 [details] Screenshot of reduction (ToT)
Sam Weinig
Comment 5 2025-11-05 12:50:57 PST
Created attachment 477314 [details] Reduced test case
Sam Weinig
Comment 6 2025-11-05 12:53:04 PST
Created attachment 477315 [details] Reduced test case
Sam Weinig
Comment 7 2025-11-05 12:58:07 PST
Looking like an issue with the interaction of grid and margins. Probably the change to gridItemHasMargin in GridLayoutFunctions.cpp, but I need to verify that.
Sam Weinig
Comment 8 2025-11-05 13:07:48 PST
Pull request: https://github.com/WebKit/WebKit/pull/53478
EWS
Comment 9 2025-11-07 13:19:59 PST
Committed 302744@main (44b22eb1df10): <https://commits.webkit.org/302744@main> Reviewed commits have been landed. Closing PR #53478 and removing active labels.
Tim Nguyen (:ntim)
Comment 10 2026-02-27 13:20:32 PST
https://github.com/web-platform-tests/wpt/pull/56103
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