— Two crowns — Same mass, different density — Vertical slider — Slider works — Slider controls crowns — Slider direction correct — Full slider range — Fall animation ✓ Water displacement ✓ Rising water level — Splash effects — Physics correct — Live mass value ✓ Live volume value — Live density value ✓ Live displaced water — Gilded displaces more — Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Generic Archimedes demo with a single red cube and a button — no crowns, no slider, no per-crown physics, no Heureka animation; misses nearly every specified requirement.
Generic Archimedes demo with a single red cube and a button — no crowns, no slider, no per-crown physics, no Heureka animation; misses nearly every specified requirement.