✓ 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 is top/air but slider renders at bottom visually due to no -webkit-slider-thumb inversion), crown translateY goes negative (upward) as slider increases making crowns move away from tanks instead of into them, and mass/volume/density displays are static labels rather than live values.
Slider direction is inverted (value=0 is top/air but slider renders at bottom visually due to no -webkit-slider-thumb inversion), crown translateY goes negative (upward) as slider increases making crowns move away from tanks instead of into them, and mass/volume/density displays are static labels rather than live values.