✓ 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
Strong implementation with correct physics (19.3 vs 13.0 g/cm³, same 1000 g mass, larger volume crown displaces more), animated water shimmer, splash particles, and Heureka trigger, but crowns teleport instantly with the slider rather than falling (no gravity-based fall animation), and the water rise indicator shows raw pixel values instead of physically meaningful cm³ units.
Strong implementation with correct physics (19.3 vs 13.0 g/cm³, same 1000 g mass, larger volume crown displaces more), animated water shimmer, splash particles, and Heureka trigger, but crowns teleport instantly with the slider rather than falling (no gravity-based fall animation), and the water rise indicator shows raw pixel values instead of physically meaningful cm³ units.