✓ 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 (instruction says "move up to submerge" but HTML range inputs rotated -90° map high values to the top visually, and the slider starts at 0=air which is actually at the bottom of a rotated range, creating a confusing UX); no distinct fall/drop animation — crowns simply interpolate linearly from above the tank to the bottom without a freefall phase.
12,100 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (instruction says "move up to submerge" but HTML range inputs rotated -90° map high values to the top visually, and the slider starts at 0=air which is actually at the bottom of a rotated range, creating a confusing UX); no distinct fall/drop animation — crowns simply interpolate linearly from above the tank to the bottom without a freefall phase.