✓ 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
Both crowns reach identical water-level heights at all depths (ratio-based normalization cancels out volume difference), so the demo never visually demonstrates that the gilded crown displaces more water; also mass/volume/density values are static, not live-updating.
Both crowns reach identical water-level heights at all depths (ratio-based normalization cancels out volume difference), so the demo never visually demonstrates that the gilded crown displaces more water; also mass/volume/density values are static, not live-updating.