✓ 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
Highly complete SVG-based implementation with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000g mass), live displaced-water readout, splash particles, rising water levels, and Heureka animation — minor flaw: mass/volume/density values in the data panels are static (not dynamically updated per submersion fraction), and the water-rise pixel scale is arbitrary rather than derived from stated cross-section area units.
12,496 output tokens · claude-opus-4-6 · end_turn
Highly complete SVG-based implementation with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000g mass), live displaced-water readout, splash particles, rising water levels, and Heureka animation — minor flaw: mass/volume/density values in the data panels are static (not dynamically updated per submersion fraction), and the water-rise pixel scale is arbitrary rather than derived from stated cross-section area units.