✓ 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 — the label says "⬆ Luft / ⬇ Wasser" and instructs dragging down for submersion, but a vertical range input with writing-mode:vertical-lr and direction:rtl maps value=0 (top of thumb) to air and value=100 (bottom) to water, which is correct conceptually yet the native thumb moves bottom-to-top for increasing values in this CSS setup, making the actual interaction confusing and functionally inverted for most browsers; all other features (physics, live values, Heureka overlay, splash particles, rising water indicator) are well-implemented.
Slider direction is inverted — the label says "⬆ Luft / ⬇ Wasser" and instructs dragging down for submersion, but a vertical range input with writing-mode:vertical-lr and direction:rtl maps value=0 (top of thumb) to air and value=100 (bottom) to water, which is correct conceptually yet the native thumb moves bottom-to-top for increasing values in this CSS setup, making the actual interaction confusing and functionally inverted for most browsers; all other features (physics, live values, Heureka overlay, splash particles, rising water indicator) are well-implemented.