— 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
This is a generic Archimedes buoyancy demo with a single red box and horizontal sliders — it has no crowns, no two-object comparison, no water displacement, no vertical slider, and no Heureka animation, missing nearly every core requirement of the prompt.
This is a generic Archimedes buoyancy demo with a single red box and horizontal sliders — it has no crowns, no two-object comparison, no water displacement, no vertical slider, and no Heureka animation, missing nearly every core requirement of the prompt.