✓ 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 at top maps to crowns in air, but the writing-mode/rtl combination means dragging up increases value toward water, not air); mass/volume/density panels show static hardcoded values rather than live-updating ones; no genuine fall animation — crowns are manually dragged by slider rather than animating freely.
Slider direction is inverted (value=0 at top maps to crowns in air, but the writing-mode/rtl combination means dragging up increases value toward water, not air); mass/volume/density panels show static hardcoded values rather than live-updating ones; no genuine fall animation — crowns are manually dragged by slider rather than animating freely.