FAILURE MAP
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Text selection replacement: Backward selections start replacement at the anchor · case 05

Backward selections start replacement at the anchor.

Member previewVariant 5 · 3 implementations · 12 checks per implementation

Case contract

Composition is preserved; replace the normalized half-open selection and collapse both endpoints immediately after inserted text.

Why this case matters

A deterministic model of text selection replacement; 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["abcdXYef", 6, 6]["aXYef", 3, 3]Failed

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