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Gate nested navigation on beforeunload - #578
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This was referenced Sep 19, 2026
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Closes #577. Advances #267 and #264.
Dispatch synchronous cancelable nested
beforeunloadbefore iframesrcnavigation anddocument.open()replacement. A veto preserves the current realm, generation, tasks, resources and stableWindowProxy; same-frame reentrancy is guarded while sibling documents remain independent.WPT-shaped and native source contracts document the lifecycle boundary.
git diff --checkpassed; authored contracts and runtime gates were not executed under the current implementation-throughput policy.