✓ 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 with writing-mode+direction:rtl the visual top corresponds to value=100/water, making the control semantically backwards); physics values and all live readouts are correct and well-presented.
Slider direction is inverted (min=0 labeled "Luft" at top maps to crowns in air, but with writing-mode+direction:rtl the visual top corresponds to value=100/water, making the control semantically backwards); physics values and all live readouts are correct and well-presented.