✓ 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
All required features are implemented with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass) and a polished SVG design, but the slider is a custom SVG drag element rather than a native range input, and the water-rise pixel scaling (0.5 px/cm³) is an arbitrary exaggeration that understates the volume difference visually — the gilded crown's larger displacement is present but subtle.
10,199 output tokens · claude-opus-4-6 · end_turn
All required features are implemented with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass) and a polished SVG design, but the slider is a custom SVG drag element rather than a native range input, and the water-rise pixel scaling (0.5 px/cm³) is an arbitrary exaggeration that understates the volume difference visually — the gilded crown's larger displacement is present but subtle.