✓ 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 means "In der Luft" but HTML range inputs render 0 at bottom on vertical, and crown starts at top=-50px moving down, so logic is arguably correct visually, but labels are ambiguous); mass/volume/density values are static (not live/updating), only displaced water updates live; no smooth fall animation (crowns jump position via slider, no independent animation).
Slider direction is inverted (value=0 at top means "In der Luft" but HTML range inputs render 0 at bottom on vertical, and crown starts at top=-50px moving down, so logic is arguably correct visually, but labels are ambiguous); mass/volume/density values are static (not live/updating), only displaced water updates live; no smooth fall animation (crowns jump position via slider, no independent animation).