✓ 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 is horizontal (CSS rotateZ trick, not a true vertical input), direction is inverted (value 0 = crowns in air, 100 = submerged is correct direction BUT slider visually appears horizontal), splash effects use random noise causing flickering, and submerge logic uses a simplified binary 0-1 factor rather than true partial-volume physics.
Slider is horizontal (CSS rotateZ trick, not a true vertical input), direction is inverted (value 0 = crowns in air, 100 = submerged is correct direction BUT slider visually appears horizontal), splash effects use random noise causing flickering, and submerge logic uses a simplified binary 0-1 factor rather than true partial-volume physics.