✓ 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 (writing-mode bt-lr makes value=0 at bottom, so dragging up increases depth — semantically crown starts in water at top, in air at bottom), and crowns are drawn as featureless circles rather than crown shapes, with no true fall animation (position is purely linearly interpolated with no drop physics).
Slider direction is inverted (writing-mode bt-lr makes value=0 at bottom, so dragging up increases depth — semantically crown starts in water at top, in air at bottom), and crowns are drawn as featureless circles rather than crown shapes, with no true fall animation (position is purely linearly interpolated with no drop physics).