✓ 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/top = crowns in air is correct conceptually, but writing-mode bt-lr with min=0 at bottom means dragging up increases value, putting crowns in water at slider top — direction is wrong); mass/volume/density displays are static not live; no smooth fall animation, only instant position jump.
Slider direction is inverted (value=0/top = crowns in air is correct conceptually, but writing-mode bt-lr with min=0 at bottom means dragging up increases value, putting crowns in water at slider top — direction is wrong); mass/volume/density displays are static not live; no smooth fall animation, only instant position jump.