✓ 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 means crowns in air is correct, but the -webkit-appearance:slider-vertical renders top=max by default in most browsers, so crowns actually start submerged); no smooth fall animation — crowns jump discontinuously as the slider moves, and splash triggers are sparse/random rather than tied to water-entry moment.
Slider direction is inverted (value=0 at top means crowns in air is correct, but the -webkit-appearance:slider-vertical renders top=max by default in most browsers, so crowns actually start submerged); no smooth fall animation — crowns jump discontinuously as the slider moves, and splash triggers are sparse/random rather than tied to water-entry moment.