RESOLVED DUPLICATE of bug 303535305304
Large number of unclosed `{` in CSS crashes WebKit on iOS 
https://bugs.webkit.org/show_bug.cgi?id=305304
Summary Large number of unclosed `{` in CSS crashes WebKit on iOS
neil
Reported 2026-01-11 19:07:50 PST
Created attachment 477973 [details] Minimal test case to reproduce crash Steps to reproduce: 1. Open attached minimal test case in Safari on iOS 26.2 Expected behaviour: Page renders Actual behavaiour: WebKit crashes: "A problem repeatedly occurred on {URL}" The page is just a style tag with a load of style declarations that are missing their closing bracket. Obviously this is invalid and the author shouldn't have done it, but it also shouldn't cause a crash! This is reduced from the HTML in a real email a customer of ours (Fastmail) received, and would crash our webmail every time they opened it. Note, I have put in the minimum number of declarations to cause a crash. If I remove any more, the crash no longer occurs.
Attachments
Minimal test case to reproduce crash (2.42 KB, text/html)
2026-01-11 19:07 PST, neil 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2026-01-12 12:54:12 PST
Thank you for the report! I could reproduce this, and from the stack trace, this looks the same as bug 303535. The fix is not in any shipping or beta build yet. *** This bug has been marked as a duplicate of bug 303535 ***
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