✓ 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 (HTML min=0/max=1000 with value=0 at top renders crowns in air correctly, but the rotated range input means dragging "down" visually increases value, which is non-intuitive and effectively inverted UX); live mass, volume, and density values are static labels rather than dynamic live readouts; no fall/drop animation — crowns teleport based on slider; displacement comparison bar is a nice addition, but the immersion percentage is identical for both crowns, masking the key physical distinction.
9,679 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (HTML min=0/max=1000 with value=0 at top renders crowns in air correctly, but the rotated range input means dragging "down" visually increases value, which is non-intuitive and effectively inverted UX); live mass, volume, and density values are static labels rather than dynamic live readouts; no fall/drop animation — crowns teleport based on slider; displacement comparison bar is a nice addition, but the immersion percentage is identical for both crowns, masking the key physical distinction.