✓ 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 (not vertical) and direction is inverted (0=air, 100=water but slider moves left-to-right), displaced-volume logic has bugs (hardcoded 12.6 subtraction, gilded volume inconsistency vs. computed value), and there is no continuous fall animation — crowns jump positions based on slider with no frame-by-frame gravity.
Slider is horizontal (not vertical) and direction is inverted (0=air, 100=water but slider moves left-to-right), displaced-volume logic has bugs (hardcoded 12.6 subtraction, gilded volume inconsistency vs. computed value), and there is no continuous fall animation — crowns jump positions based on slider with no frame-by-frame gravity.