RESOLVED FIXED308561
[Site Isolation] Add UseUIProcessForBackForwardItemLoading preference for UIProcess-driven back/forward child frame navigation. 
https://bugs.webkit.org/show_bug.cgi?id=308561
Summary [Site Isolation] Add UseUIProcessForBackForwardItemLoading preference for UIP...
Basuke Suzuki
Reported 2026-02-24 10:38:59 PST
Add a new WebKit preference UseUIProcessForBackForwardItemLoading to gate the UIProcess-driven back/forward navigation feature for child frames. - Add UseUIProcessForBackForwardItemLoading to UnifiedWebPreferences.yaml (type bool, status unstable, default false for all layers) - Expose _useUIProcessForBackForwardItemLoading / _setUseUIProcessForBackForwardItemLoading: on WKPreferences via WKPreferencesPrivate.h and WKPreferences.mm This flag will be used to guard all new code paths introduced in subsequent patches.
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Add attachment proposed patch, testcase, etc.
Basuke Suzuki
Comment 1 2026-02-24 10:44:37 PST
rdar://171032272
Basuke Suzuki
Comment 2 2026-02-24 10:46:49 PST
Pull request: https://github.com/WebKit/WebKit/pull/59340
EWS
Comment 3 2026-02-24 15:40:35 PST
Committed 308158@main (9be7f5a90caa): <https://commits.webkit.org/308158@main> Reviewed commits have been landed. Closing PR #59340 and removing active labels.
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