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Accordion open-panel state: Single-open accordions accumulate expanded panels · case 03

Single-open accordions accumulate expanded panels.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Discard removed panels; ignore invalid targets; expanded panels close only when collapsible; multiple mode unions and single mode replaces.

Why this case matters

A deterministic model of accordion open-panel state; 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
single["a", "b"]["b"]Failed

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

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