✓ 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
Slider direction is inverted (value=0 at top = crowns in air is correct in mapping but the native vertical slider renders with 0 at bottom, putting crowns in water at top); mass/volume/density values are static labels rather than live-updating displays; no fall animation — crowns jump positions rather than animating a descent into water.
Slider direction is inverted (value=0 at top = crowns in air is correct in mapping but the native vertical slider renders with 0 at bottom, putting crowns in water at top); mass/volume/density values are static labels rather than live-updating displays; no fall animation — crowns jump positions rather than animating a descent into water.