✓ 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 (label says "⬆ Luft / ⬇ Wasser" but HTML range inputs rendered vertically with writing-mode:vertical-lr/direction:rtl map max(100) to the top, meaning dragging up increases submersion rather than the correct top=air/bottom=water convention); all physics, live values, splash, water-rise, and Heureka are well-implemented.
Slider direction is inverted (label says "⬆ Luft / ⬇ Wasser" but HTML range inputs rendered vertically with writing-mode:vertical-lr/direction:rtl map max(100) to the top, meaning dragging up increases submersion rather than the correct top=air/bottom=water convention); all physics, live values, splash, water-rise, and Heureka are well-implemented.