— 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
A generic Archimedes buoyancy demo with a single cube and horizontal sliders — no crowns, no mass values, no Heureka moment, and essentially none of the crown-comparison features specified in the prompt.
A generic Archimedes buoyancy demo with a single cube and horizontal sliders — no crowns, no mass values, no Heureka moment, and essentially none of the crown-comparison features specified in the prompt.