✓ 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
Physics values are correct (same mass 1000g, gold 19.3 g/cm³ vs gilded 8.0 g/cm³, larger volume displaces more), but the ASCII-art visualization is static/non-animated — crowns don't smoothly fall, splash effects are random noise rather than real transitions, and the custom slider is drag-only with no `<input type="range">` native control, making it somewhat awkward.
Physics values are correct (same mass 1000g, gold 19.3 g/cm³ vs gilded 8.0 g/cm³, larger volume displaces more), but the ASCII-art visualization is static/non-animated — crowns don't smoothly fall, splash effects are random noise rather than real transitions, and the custom slider is drag-only with no `<input type="range">` native control, making it somewhat awkward.