✓ 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
Solid, well-structured implementation with correct physics (same 1000 g mass, gold 19.3 g/cm³/51.8 cm³ vs gilded 13.0 g/cm³/76.9 cm³), live data panel, splash effects, rising water levels, and Heureka overlay — but the crown motion is purely slider-driven without any autonomous fall/drop animation, and the buoyancy force display incorrectly equals displaced volume in cm³ rather than converting to Newtons or gram-force units properly.
Solid, well-structured implementation with correct physics (same 1000 g mass, gold 19.3 g/cm³/51.8 cm³ vs gilded 13.0 g/cm³/76.9 cm³), live data panel, splash effects, rising water levels, and Heureka overlay — but the crown motion is purely slider-driven without any autonomous fall/drop animation, and the buoyancy force display incorrectly equals displaced volume in cm³ rather than converting to Newtons or gram-force units properly.