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Live-region announcement scheduling: Atomic announcements read only the appended fragment · case 03

Atomic announcements read only the appended fragment.

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
atomic	`[[], "5"]`	`[[], "2 of 5"]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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