FA-8837 / Selection controls / Member archive

Radio group selection ownership: Removing the selected required option leaves the group unselected · case 02

Removing the selected required option leaves the group unselected.

Member previewVariant 2 · 3 implementations · 11 checks per implementation

Case contract

Radio activation replaces selection with an existing enabled option and never toggles it off; required groups cannot clear; selected removal uses first remaining option only when required.

Why this case matters

A deterministic model of radio group selection ownership; 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
required removal	`[["b", "c"], null]`	`[["b", "c"], "b"]`	Failed

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

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