FA-8423 / Assistive announcements / Member archive

Live-region announcement scheduling: Urgent announcements wait behind polite messages · case 03

Urgent announcements wait behind polite messages.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Suppress identical and off updates; busy queues preserve order; assertive updates supersede pending work; atomic reads full content and incremental mode reads appended content.

Why this case matters

A deterministic model of live-region announcement scheduling; 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 fixture	Actual	Expected	Outcome
urgent	`[["old pending", "urgent"], "old"]`	`[[], "urgent"]`	Failed

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