Sticky header — expected once at the beginning
Fixed control
1

Capture fixture start

This page is deterministic, self-contained and intentionally long. Record viewport, zoom and browser version before capture.

Stable card A
Stable card B
Stable card C
2

Alternating background boundary

A missing or repeated horizontal strip should be visible where section colors meet.

Delayed block 2
3

Dense table

MarkerExpected orderBoundary check
3-AAfter 2No overlap
3-BBefore 4No missing row
3-CFinal table rowKeep alignment
4

Canvas stripe sequence

Repeated or missing stripes reveal overlap and gaps.

5

Delayed visual blocks

Delayed 5-A
Delayed 5-B
Delayed 5-C
6

Long paragraph wrapping

Viewport width changes this paragraph's line count and therefore the page height. Compare only runs made with the same viewport and zoom. The fixture uses ordinary document flow so a stable run should preserve every line without duplication.

7

Final pre-endpoint section

7-A
7-B
7-C
8

Expected final endpoint

If this is absent, record the last visible marker.