✓ 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 "Luft" at top maps to crowns in air, but the vertical slider's RTL/direction:rtl styling causes the physical top of the slider to correspond to value=0, which is actually correct logically—however crowns enter water at slider=30 meaning the top third of slider travel does nothing visible, and there is no smooth fall animation, just a jump based on slider position; ASCII art approach is creative but splash/fall animations are rudimentary.
Slider direction is inverted (min=0 labeled "Luft" at top maps to crowns in air, but the vertical slider's RTL/direction:rtl styling causes the physical top of the slider to correspond to value=0, which is actually correct logically—however crowns enter water at slider=30 meaning the top third of slider travel does nothing visible, and there is no smooth fall animation, just a jump based on slider position; ASCII art approach is creative but splash/fall animations are rudimentary.