✓ 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 (top=100%/water, bottom=0%/air) and crowns move identically so the density difference isn't visually apparent; ASCII-art approach is charming but fall animation is absent — crowns teleport with no autonomous drop sequence.
Slider direction is inverted (top=100%/water, bottom=0%/air) and crowns move identically so the density difference isn't visually apparent; ASCII-art approach is charming but fall animation is absent — crowns teleport with no autonomous drop sequence.