✓ 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
Solid physics and data display (gold 19.3 g/cm³, iron 7.8 g/cm³, same mass), but the slider is a custom drag widget rather than a native range input, lacks smooth fall animation (crowns teleport via top% with no transition), and Heureka only triggers at exactly depth===100 which is nearly impossible to hit by dragging.
Solid physics and data display (gold 19.3 g/cm³, iron 7.8 g/cm³, same mass), but the slider is a custom drag widget rather than a native range input, lacks smooth fall animation (crowns teleport via top% with no transition), and Heureka only triggers at exactly depth===100 which is nearly impossible to hit by dragging.