✓ 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
All 21 required features are implemented correctly; the one notable weakness is that the water-rise pixel scale (9 px/cm with a 100 cm² cross-section assumption) is somewhat arbitrary, making the visual rise subtle for the ~52 cm³ displacement, but the numerical values and Archimedes physics are self-consistent and accurate.
All 21 required features are implemented correctly; the one notable weakness is that the water-rise pixel scale (9 px/cm with a 100 cm² cross-section assumption) is somewhat arbitrary, making the visual rise subtle for the ~52 cm³ displacement, but the numerical values and Archimedes physics are self-consistent and accurate.