✓ 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 (LUFT at top label but 0%=start maps incorrectly due to rotate+bt-lr combo; crown/water rendering is inconsistent — level1 is scaled ×1.3 and level2 ×0.95 asymmetrically with no actual rising water line, and there is no fall animation, only a static symbol jump.
Slider direction is inverted (LUFT at top label but 0%=start maps incorrectly due to rotate+bt-lr combo; crown/water rendering is inconsistent — level1 is scaled ×1.3 and level2 ×0.95 asymmetrically with no actual rising water line, and there is no fall animation, only a static symbol jump.