✓ 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
Live mass, volume, and density values are static (hardcoded in HTML, not updated by JS), so only displaced water and buoyancy are truly live; no fall animation—crowns teleport rather than animate downward.
Live mass, volume, and density values are static (hardcoded in HTML, not updated by JS), so only displaced water and buoyancy are truly live; no fall animation—crowns teleport rather than animate downward.