FA-8582 / Tab interfaces / Member archive

Tab selection and activation mode: Disabled tabs remain keyboard navigable · case 02

Disabled tabs remain keyboard navigable.

Member previewVariant 2 · 3 implementations · 10 checks per implementation

Case contract

Focus traverses enabled tabs; automatic mode activates on focus, manual mode requires Enter or Space; removed focus or selection falls back to first enabled tab.

Why this case matters

A deterministic model of tab selection and activation mode; 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
disabled	`["b", "b"]`	`["c", "c"]`	Failed

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

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