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Outline ancestry follows transport arrival order · case 03

Outline ancestry follows transport arrival order.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

A document heading inventory receives records [id,level,text,exposed,document,order] and requested document. Admit exposed level integers 1..6 (booleans are not levels), nonempty text after ASCII trimming, exact document. For duplicate IDs retain the earliest order record; ties retain first input. Output sorted by order with each heading's nearest preceding lower-level heading ID as parent. Skipped levels do not create synthetic headings. Output [id,level,trimmed_text,parent].

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
sort document order	`[["b", 2, "B", null], ["a", 1, "A", null]]`	`[["a", 1, "A", null], ["b", 2, "B", "a"]]`	Failed

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