— 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
Completely wrong demo: shows a generic Archimedes buoyancy simulator with a single rectangular block and horizontal sliders, not the two-crown (pure gold vs. gilded) Archimedes/Hiero narrative required by the prompt — core features (two crowns, vertical slider, fall animation, splash, rising water level, Heureka moment) are entirely absent.
Completely wrong demo: shows a generic Archimedes buoyancy simulator with a single rectangular block and horizontal sliders, not the two-crown (pure gold vs. gilded) Archimedes/Hiero narrative required by the prompt — core features (two crowns, vertical slider, fall animation, splash, rising water level, Heureka moment) are entirely absent.