✓ 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 labeled "OBEN/Luft" maps to crowns in air but slider thumb at top = value 0 meaning air is correct, however the transform:rotate(180deg) on a writing-mode:vertical-rl slider causes the visual top to represent value 100/water, making direction effectively inverted for the user); no true fall animation—crown position is linearly interpolated without any time-based animation.
Slider direction is inverted (min=0 labeled "OBEN/Luft" maps to crowns in air but slider thumb at top = value 0 meaning air is correct, however the transform:rotate(180deg) on a writing-mode:vertical-rl slider causes the visual top to represent value 100/water, making direction effectively inverted for the user); no true fall animation—crown position is linearly interpolated without any time-based animation.