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Overlay dismissal stack: Escape closes layers explicitly configured nondismissible · case 03

Escape closes layers explicitly configured nondismissible.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Only the topmost overlay handles Escape/outside policy; inside descendants are exempt; explicit unmount removes only its identity.

Why this case matters

A deterministic model of overlay dismissal stack; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixtureActualExpectedOutcome
protected escape[][{"escape": false, "id": "a", "inside": ["a"], "outside": false}]Failed

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