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Virtualized row visibility: A row starting at the viewport bottom is rendered as visible · case 03

A row starting at the viewport bottom is rendered as visible.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Rows overlap a half-open viewport using cumulative measured heights; overscan expands both sides and clamps to valid row indices.

Why this case matters

A deterministic model of virtualized row visibility; 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
top edge[1, 2][1]Failed

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