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Anchored overlay placement: An overlay aligns to the wrong horizontal anchor edge · case 04

An overlay aligns to the wrong horizontal anchor edge.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Place below with a gap when fully fitting; otherwise above; align left edges and clamp both axes so oversized overlays start at zero.

Why this case matters

A deterministic model of anchored overlay placement; 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
below[30, 43][10, 43]Failed

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

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