✓ 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
Comprehensive ASCII-art implementation with correct physics (gold 19.3, gilded 8.5 g/cm³, same 1000g mass), live panel values, splash, rising water, and Heureka overlay — but the slider direction is inverted (value=0 is top/air yet maps correctly in code via sv=0→crowns above, which is actually correct behavior; however the CSS/appearance uses writing-mode vertical-lr with direction:rtl which on most browsers renders the thumb at the bottom for value=0, making the physical top=submerged, bottom=air — inverted UX).
Comprehensive ASCII-art implementation with correct physics (gold 19.3, gilded 8.5 g/cm³, same 1000g mass), live panel values, splash, rising water, and Heureka overlay — but the slider direction is inverted (value=0 is top/air yet maps correctly in code via sv=0→crowns above, which is actually correct behavior; however the CSS/appearance uses writing-mode vertical-lr with direction:rtl which on most browsers renders the thumb at the bottom for value=0, making the physical top=submerged, bottom=air — inverted UX).