✓ 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 (hint says "push up" but value=0 is air and value=100 is water, yet writing-mode bt-lr means bottom = 0 = air which is actually correct in rendering but labelled confusingly); no true fall animation (crowns teleport linearly); water-rise math is physically inconsistent (CONTAINER_AREA divides by width/100 giving implausible mm values); gilded crown density 6.25 g/cm³ is reasonable but gold density is 19.2 instead of 19.3, and the crown shapes visually overflow the SVG viewport at rest.
Slider direction is inverted (hint says "push up" but value=0 is air and value=100 is water, yet writing-mode bt-lr means bottom = 0 = air which is actually correct in rendering but labelled confusingly); no true fall animation (crowns teleport linearly); water-rise math is physically inconsistent (CONTAINER_AREA divides by width/100 giving implausible mm values); gilded crown density 6.25 g/cm³ is reasonable but gold density is 19.2 instead of 19.3, and the crown shapes visually overflow the SVG viewport at rest.