FA-38375 / Tree accessibility / Member archive

Visible tree range selection: Selection output loses visible preorder · case 05

Selection output loses visible preorder produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Selectable rows are the ordered visible preorder supplied in rows; disabled rows cannot be selected. A hidden anchor falls back to focus. Preserve outside selections only for additive ranges. Report focus, anchor, ordered selection, and branch coverage.

Why this case matters

Offline executable model of a hierarchical accessibility interaction; inputs are bounded and valid as stipulated. No browser, assistive technology, or normative ARIA conformance is claimed.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
forward	`[["c0", "c2", "c3", "c4", "c5", "c6", "z"], "c6", "z", true]`	`[["z", "c0", "c2", "c3", "c4", "c5", "c6"], "c6", "z", true]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

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

Member access is invitation-based. Sign in with your invited account to inspect the sources.