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Accordion open-panel state: An unknown panel clears other open panels · case 02

An unknown panel clears other open panels.

Member previewVariant 2 · 3 implementations · 9 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
removed[]["a"]Failed

MEMBER ARCHIVE

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

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