✓ 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 vertical slider's CSS writing-mode/direction means dragging up increases value, so top=submerged/bottom=air), and the rise annotation labels "px" instead of physical cm³ units, but overall physics, live values, splash, heureka, and visual polish are well-implemented.
Slider direction is inverted (value=0 at top maps to crowns in air, but the vertical slider's CSS writing-mode/direction means dragging up increases value, so top=submerged/bottom=air), and the rise annotation labels "px" instead of physical cm³ units, but overall physics, live values, splash, heureka, and visual polish are well-implemented.