— 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 explainer with ASCII art and basic buttons — entirely missing crowns, slider, live values, water displacement, splash effects, and the Heureka animation required by the prompt.
A generic Archimedes explainer with ASCII art and basic buttons — entirely missing crowns, slider, live values, water displacement, splash effects, and the Heureka animation required by the prompt.