✓ 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 AIR at top, max=100 labeled WATER at bottom, but standard range inputs render min at bottom on vertical orientation — effectively reversed), and there is no frame-based fall animation (crown teleports linearly via slider with no autonomous motion).
Slider direction is inverted (min=0 labeled AIR at top, max=100 labeled WATER at bottom, but standard range inputs render min at bottom on vertical orientation — effectively reversed), and there is no frame-based fall animation (crown teleports linearly via slider with no autonomous motion).