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Sticky element container constraints: Sticky position ignores scroll displacement · case 04

Sticky position ignores scroll displacement.

Member previewVariant 4 · 3 implementations · 10 checks per implementation

Case contract

Convert normal and container positions to viewport coordinates; pin at inset until the containing block bottom, accounting for element height; report whether position differs from natural flow.

Why this case matters

A deterministic model of sticky element container constraints; 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 fixture	Actual	Expected	Outcome
natural	`[50, false]`	`[40, false]`	Failed

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