✓ 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
Slider direction is inverted (min=0 at top maps to air, but standard vertical range inputs render 0 at bottom, so top = 100 = fully submerged, inverting the intended behavior); no smooth fall animation — crowns teleport linearly with no easing, and splash effect only fires on exact integer multiples of 10 which rarely triggers during drag.
Slider direction is inverted (min=0 at top maps to air, but standard vertical range inputs render 0 at bottom, so top = 100 = fully submerged, inverting the intended behavior); no smooth fall animation — crowns teleport linearly with no easing, and splash effect only fires on exact integer multiples of 10 which rarely triggers during drag.