✓ 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 (300g both crowns, gold 19.3 vs 8.5 g/cm³), working vertical slider (top=air, bottom=water), live info panels, splash effects, rising water indicator, and a multi-frame Heureka overlay — but both crowns share identical character-row positions (fG and fF both use crownRow without volume-based offset), so the visual displacement difference between crowns is understated in the ASCII scene despite the panel values being correct.
Comprehensive ASCII-art implementation with correct physics (300g both crowns, gold 19.3 vs 8.5 g/cm³), working vertical slider (top=air, bottom=water), live info panels, splash effects, rising water indicator, and a multi-frame Heureka overlay — but both crowns share identical character-row positions (fG and fF both use crownRow without volume-based offset), so the visual displacement difference between crowns is understated in the ASCII scene despite the panel values being correct.