✓ 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 is direction-inverted (value=0 at top keeps crowns in air but the HTML vertical slider renders with 0 at bottom, causing crowns to start submerged visually at min), and crown movement is not tied to actual water entry — both crowns translate identically with no true fall animation or per-crown submersion phasing.
Slider is direction-inverted (value=0 at top keeps crowns in air but the HTML vertical slider renders with 0 at bottom, causing crowns to start submerged visually at min), and crown movement is not tied to actual water entry — both crowns translate identically with no true fall animation or per-crown submersion phasing.