FA-23769 / Client state / Member archive

Per-history-entry scroll restoration: Anchor layout gate · case 04

Anchor layout gate.

Member previewVariant 4 · 3 implementations · 60 checks per implementation

Case contract

Scroll state belongs to a history entry, not its repeated URL. Pop restores after layout, pushes start at top, explicit anchors including the empty anchor take precedence, and positions clamp to the scrollable extent. Operation anchor-layout-gate has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
anchor-layout-gate scenario 2	`null`	`"section"`	Failed

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