✓ 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 physics implementation with iterative fixed-point solver for water rise and correct volume ratio (76.9/51.8), but crown motion is instant (no smooth fall animation — crowns teleport to slider position rather than animating a drop).
Strong physics implementation with iterative fixed-point solver for water rise and correct volume ratio (76.9/51.8), but crown motion is instant (no smooth fall animation — crowns teleport to slider position rather than animating a drop).