✓ 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 at top maps to "air" correctly per hints, but the vertical slider with writing-mode+rtl means dragging up increases value → water, not air), mass/volume/density panels show static text rather than live-updating values, and the buoyancy display is labelled mN but computed correctly in N×1000.
Slider direction is inverted (min=0 at top maps to "air" correctly per hints, but the vertical slider with writing-mode+rtl means dragging up increases value → water, not air), mass/volume/density panels show static text rather than live-updating values, and the buoyancy display is labelled mN but computed correctly in N×1000.