FA-38480 / Tree accessibility / Member archive
Virtual tree sibling metadata: Active-descendant identity collides across tree instances · case 05
Active-descendant identity collides across tree instances produces the wrong hierarchical widget state in a regression fixture.
Case contract
Rows carry id,parent,logical sibling index,known sibling count,depth. The viewport must expose global sibling positions and counts, one-based depth, root ownership, expandable state only for branches, and stable identity independent of recycled slots.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| branch | [8, 13, 6, "p", true, true, true, "1", 17, true] | [8, 13, 6, "p", true, true, true, "tree:b", 17, true] | Failed |
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