✓ 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 labeled LUFT but crown starts in air and moves to water as value increases, yet the slider reads bottom=WASSER which is correct labeling but the transform:rotate(180deg) on a vertical-rl slider makes the physical drag direction counterintuitive); no density live-value box is shown (density is only in static titles); fall animation is absent — the crown teleports rather than falling.
Slider direction is inverted (value=0 at top labeled LUFT but crown starts in air and moves to water as value increases, yet the slider reads bottom=WASSER which is correct labeling but the transform:rotate(180deg) on a vertical-rl slider makes the physical drag direction counterintuitive); no density live-value box is shown (density is only in static titles); fall animation is absent — the crown teleports rather than falling.