✓ 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 (min=0=air at top label, but writing-mode+direction:rtl maps slider top visually to value 0=air, which is actually correct orientation — however the crown animation has no smooth fall; splash triggers only once and ASCII art is functional but not a true fall animation.
Slider direction is inverted (min=0=air at top label, but writing-mode+direction:rtl maps slider top visually to value 0=air, which is actually correct orientation — however the crown animation has no smooth fall; splash triggers only once and ASCII art is functional but not a true fall animation.