FA-54422 / Accessibility interaction semantics / Member archive

An outer legend exemption clears a nested disabled fieldset · case 02

An outer legend exemption clears a nested disabled fieldset.

Member previewVariant 2 · 3 implementations · 11 checks per implementation

Case contract

Input preorder nodes [id,parent,native_disabled,aria_disabled,fieldset,first_legend] and queried ID. Native disabled inherits from disabled fieldsets except descendants of their first_legend; nested disabled fieldsets remain independently effective. aria_disabled is tri-state None/True/False and nearest explicit ancestor value wins, but never cancels native disabled. Return [native_effective,aria_effective,effective] for queried node, or None when missing. An explicit native-disabled node remains disabled even when inside an exempt legend. first_legend ID belongs to fieldset; all parent links exist or None.

Why this case matters

Offline accessibility bridge model with explicit policy; useful for testing semantic API adapters independently of browser implementations.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
contract fixture 6	`[false, false, false]`	`[true, false, true]`	Failed

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