✓ 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 is inverted (min=0 at top maps to crowns in air, but writing-mode bt-lr means dragging up increases value → crowns submerge going up, not down); mass/volume/density values are static display-only, not live-updating; no actual fall animation (crown jumps/slides instantly with no easing or drop physics).
Slider is inverted (min=0 at top maps to crowns in air, but writing-mode bt-lr means dragging up increases value → crowns submerge going up, not down); mass/volume/density values are static display-only, not live-updating; no actual fall animation (crown jumps/slides instantly with no easing or drop physics).