✓ 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
Solid physics and layout, but crown movement is a position-jump rather than a smooth fall animation — there is no time-based animation curve, only immediate repositioning on slider drag.
Solid physics and layout, but crown movement is a position-jump rather than a smooth fall animation — there is no time-based animation curve, only immediate repositioning on slider drag.