✓ 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 g/cm³, fake 8.9 g/cm³, same 1000 g mass), live side-panel values, splash particles, typewriter Heureka overlay, and a 12 fps animation loop — but the vertical slider direction is inverted (slider top = crowns in water, slider bottom = crowns in air, opposite of spec).
Comprehensive ASCII-art implementation with correct physics (gold 19.3 g/cm³, fake 8.9 g/cm³, same 1000 g mass), live side-panel values, splash particles, typewriter Heureka overlay, and a 12 fps animation loop — but the vertical slider direction is inverted (slider top = crowns in water, slider bottom = crowns in air, opposite of spec).