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Anchored range selection: Backward shift selection produces an empty range · case 03

Backward shift selection produces an empty range.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Ranges include both endpoints in document order; plain clicks replace; additive selection unions; missing targets preserve selection.

Why this case matters

A deterministic model of anchored range selection; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

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

Boundary fixtureActualExpectedOutcome
backward[]["a", "b", "c"]Failed

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

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