Bug 308561

Summary:	[Site Isolation] Add UseUIProcessForBackForwardItemLoading preference for UIProcess-driven back/forward child frame navigation.
Product:	WebKit	Reporter:	Basuke Suzuki <basuke>
Component:	New Bugs	Assignee:	Basuke Suzuki <basuke>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

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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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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