✓ 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 maps to air, but with vertical-lr + direction:rtl the visual top of the slider corresponds to value 100/water, not value 0/air as intended); all physics values are correct and the ASCII-art scene cleanly shows differential water rise between the two tanks.
Slider direction is inverted (min=0 maps to air, but with vertical-lr + direction:rtl the visual top of the slider corresponds to value 100/water, not value 0/air as intended); all physics values are correct and the ASCII-art scene cleanly shows differential water rise between the two tanks.