✓ 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
Exceptionally complete SVG-based implementation with correct Archimedes physics (19.32 vs 11.0 g/cm³, same 1000g mass), live data panels, splash/bubble effects, Heureka animation, and keyboard support; main weakness is a custom drag-based "slider" rather than a native range input, and the water rise scale factor (0.35 px/cm³) is arbitrary rather than geometrically derived from tank dimensions.
13,364 output tokens · claude-opus-4-6 · end_turn
Exceptionally complete SVG-based implementation with correct Archimedes physics (19.32 vs 11.0 g/cm³, same 1000g mass), live data panels, splash/bubble effects, Heureka animation, and keyboard support; main weakness is a custom drag-based "slider" rather than a native range input, and the water rise scale factor (0.35 px/cm³) is arbitrary rather than geometrically derived from tank dimensions.