✓ 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 (value=0 at bottom maps crowns to air, but the native vertical slider renders with 0 at bottom meaning dragging up increases value — crowns descend as slider goes up, which is backward); no smooth fall animation, crowns teleport instantly to position rather than animating a fall sequence.
Slider direction is inverted (value=0 at bottom maps crowns to air, but the native vertical slider renders with 0 at bottom meaning dragging up increases value — crowns descend as slider goes up, which is backward); no smooth fall animation, crowns teleport instantly to position rather than animating a fall sequence.