REOPENED307121
[Site Isolation] Back navigation fails when page contains iframe that navigated cross-site. 
https://bugs.webkit.org/show_bug.cgi?id=307121
Summary [Site Isolation] Back navigation fails when page contains iframe that navigat...
Basuke Suzuki
Reported 2026-02-05 17:01:56 PST
When Site Isolation is enabled, back navigation incorrectly targets a cross-site iframe instead of the main frame when the iframe had previously navigated to a different site. Reproduction with Site Isolation enabled: 1. Load Page A (site A) with same-site iframe C (site A) 2. iframe navigates cross-site: C → D (site B) 3. Main frame navigates: Page A → Page B (same site with A) 4. Call goBack() Expected behavior: - goBack() should navigate the main frame back to Page A with page D in iframe Actual behavior: - page C is displayed in iframe
Attachments
Add attachment proposed patch, testcase, etc.
Basuke Suzuki
Comment 1 2026-02-05 17:03:44 PST
rdar://169754535
Basuke Suzuki
Comment 2 2026-02-05 20:28:17 PST
Pull request: https://github.com/WebKit/WebKit/pull/58023
EWS
Comment 3 2026-02-09 09:25:48 PST
Committed 307081@main (5fa8be5b7960): <https://commits.webkit.org/307081@main> Reviewed commits have been landed. Closing PR #58023 and removing active labels.
Sihui Liu
Comment 4 2026-02-13 09:12:46 PST
Reopened Bugzilla. Caused crash in PLT, tracking revert in https://bugs.webkit.org/show_bug.cgi?id=307808.
Basuke Suzuki
Comment 5 2026-02-13 12:09:58 PST
Pull request: https://github.com/WebKit/WebKit/pull/58653
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