✓ 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 is top/LUFT but min=0 maps thumb to bottom in a bt-lr vertical slider), the heureka trigger compares a number to the string '100' (always false), water height calculation is nonsensical (displacedVolume/250*250 = raw cm³ treated as pixels), and there is no fall animation — crowns teleport rather than animate into water.
Slider direction is inverted (value=0 is top/LUFT but min=0 maps thumb to bottom in a bt-lr vertical slider), the heureka trigger compares a number to the string '100' (always false), water height calculation is nonsensical (displacedVolume/250*250 = raw cm³ treated as pixels), and there is no fall animation — crowns teleport rather than animate into water.