✓ 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 horizontal (CSS-rotated range input, not a true vertical slider), direction is inverted (value=0 at left/top = crowns in air is correct by accident but rotation semantics are ambiguous), and mass/volume/density values are static rather than live-updating.
Slider is horizontal (CSS-rotated range input, not a true vertical slider), direction is inverted (value=0 at left/top = crowns in air is correct by accident but rotation semantics are ambiguous), and mass/volume/density values are static rather than live-updating.