✓ 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 (label says "↑ Luft / ↓ Wasser" but writing-mode+direction CSS makes the native slider top=max=100=water, bottom=min=0=air, which is correct behaviorally — however, the right-container water rise is artificially scaled down by 0.75 factor making it visually show LESS displacement than the gold crown, directly contradicting the core physics demonstration; the gilded crown should show MORE rise.
Slider direction is inverted (label says "↑ Luft / ↓ Wasser" but writing-mode+direction CSS makes the native slider top=max=100=water, bottom=min=0=air, which is correct behaviorally — however, the right-container water rise is artificially scaled down by 0.75 factor making it visually show LESS displacement than the gold crown, directly contradicting the core physics demonstration; the gilded crown should show MORE rise.