✓ 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
Mass, volume, and density values are static (hardcoded text, not live-updating elements), so only displaced water qualifies as a live value; no fall animation — crowns teleport linearly rather than animating into water.
Mass, volume, and density values are static (hardcoded text, not live-updating elements), so only displaced water qualifies as a live value; no fall animation — crowns teleport linearly rather than animating into water.