✓ 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 "air," but the slider-vertical orientation with direction:rtl likely renders bottom=air visually); ASCII-art canvas is creative but animation is discrete/jumpy with no easing, and splash effects are static character patterns rather than true animation.
Slider direction is inverted (min=0 at top maps to "air," but the slider-vertical orientation with direction:rtl likely renders bottom=air visually); ASCII-art canvas is creative but animation is discrete/jumpy with no easing, and splash effects are static character patterns rather than true animation.