✓ 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/top = air, value=100/bottom = water maps crown top to 280px, meaning max slider pushes crown DOWN, but the crown starts at top of container not above it), water displacement math is arbitrary/non-physical, mass/volume/density values are static (not live), and no fall animation — crown teleports rather than animates.
Slider direction is inverted (value=0/top = air, value=100/bottom = water maps crown top to 280px, meaning max slider pushes crown DOWN, but the crown starts at top of container not above it), water displacement math is arbitrary/non-physical, mass/volume/density values are static (not live), and no fall animation — crown teleports rather than animates.