✓ 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 (slider bottom = crowns near top of air, slider top = crowns fully submerged) and there is no smooth fall animation — crowns jump instantly with no timed descent or entry transition.
Slider direction is inverted (slider bottom = crowns near top of air, slider top = crowns fully submerged) and there is no smooth fall animation — crowns jump instantly with no timed descent or entry transition.