✓ 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 (min=0 at top maps to crowns in air, but the position formula `100 - depth*0.7` causes crowns to start at y=100 and clamp nonsensically at y=320, making top=air technically correct but the crown Y-position logic is broken/confusing); water-rise calculation uses arbitrary unit mixing rather than genuine Archimedes physics; no smooth fall animation — crowns teleport based on slider value.
Slider direction is inverted (min=0 at top maps to crowns in air, but the position formula `100 - depth*0.7` causes crowns to start at y=100 and clamp nonsensically at y=320, making top=air technically correct but the crown Y-position logic is broken/confusing); water-rise calculation uses arbitrary unit mixing rather than genuine Archimedes physics; no smooth fall animation — crowns teleport based on slider value.