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Tree drop accessibility descriptor: Sibling partition restriction leaks into valid nesting · case 03

Sibling partition restriction leaks into valid nesting produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

A drag advertises one legal drop location at a time. Inside requires a writable branch; before/after require a parent and same sibling partition. Self and descendant targets are forbidden. Copy needs copy permission. Descriptor includes announced hierarchy level and one-based insertion position.

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
partition mismatch	`[true, "p", 5, 4, "copy"]`	`[false, "p", 5, 4, "none"]`	Failed

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

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