✓ 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" at top but writing-mode+direction:rtl means dragging up increases value → submerges crowns, contradicting the label), which is the primary UX flaw in an otherwise polished, feature-complete implementation.
Slider direction is inverted (label says "⬆ Luft" at top but writing-mode+direction:rtl means dragging up increases value → submerges crowns, contradicting the label), which is the primary UX flaw in an otherwise polished, feature-complete implementation.