FA-8822 / Viewport layout / Member archive

Sticky element container constraints: The sticky element extends beyond its containing block · case 02

The sticky element extends beyond its containing block.

Member previewVariant 2 · 3 implementations · 8 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
container exits	`[5, true]`	`[0, true]`	Failed

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

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