✓ 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
Comprehensive SVG implementation hits nearly every required feature with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000g mass, larger displaced volume for gilded crown), but splash animation is cosmetically weak (particles don't truly fly/arc) and the water-level rise differential (~26px vs ~38px) is visually subtle enough that the key Archimedes comparison could be missed without reading the data panel.
9,206 output tokens · claude-opus-4-6 · end_turn
Comprehensive SVG implementation hits nearly every required feature with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000g mass, larger displaced volume for gilded crown), but splash animation is cosmetically weak (particles don't truly fly/arc) and the water-level rise differential (~26px vs ~38px) is visually subtle enough that the key Archimedes comparison could be missed without reading the data panel.