Scroll slowly. Each picture drifts inside its frame in the labelled direction — watch the CENTRE mark move against the frame. No edge of the picture should ever show.
Untouched parallax (unchanged): drifts down, ±6%.
Up (reverse).
Left, speed 12: RIGHT edge slides into view as you scroll.
Right, speed 8.
Fast (speed 18), just enough zoom: the 25%/75% grid lines show how much is cropped.
Extra zoom 25%.
No crop — the whole image moves (speed 10): every label stays visible; it moves within space kept above and below and never covers this text or the next.
Text right after it — never overlapped.
A narrow image (320px) in a wide space — the fixed spill: the zoom stays inside the picture’s own edges; nothing appears to its right.
Break out of frame — Up, speed 12: the whole picture rises past its neighbours like a card (it overlaps this text and the next while it moves; that is expected).
Text the card passes over.
Break out of frame — sideways (left, speed 8): the picture drifts across, unclipped; the page never scrolls sideways.
Real photos: the lake, classic; the towers, tall, Up.
