✓ 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/top=air is correct in intent but the vertical slider CSS uses rtl+vertical-lr which typically renders bottom=0, making top of slider correspond to water, not air); no true fall animation — crowns teleport/interpolate without a distinct dropping phase.
Slider direction is inverted (min=0/top=air is correct in intent but the vertical slider CSS uses rtl+vertical-lr which typically renders bottom=0, making top of slider correspond to water, not air); no true fall animation — crowns teleport/interpolate without a distinct dropping phase.