— 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 buoyancy demo with a single rectangular block and horizontal sliders — completely missing the two-crown scenario, fall animation, splash effects, rising water level, and vertical slider required by the prompt.
Generic Archimedes buoyancy demo with a single rectangular block and horizontal sliders — completely missing the two-crown scenario, fall animation, splash effects, rising water level, and vertical slider required by the prompt.