✓ 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 prompt requirements are implemented correctly — same mass (1000 g), physically plausible densities (19.3 vs 13.0 g/cm³), visually larger alloy crown displaces more water, live stats update, splash particles and Heureka fade-in trigger at full submersion — but mass/volume/density values in the panels are static text rather than dynamically computed, and the slider is a custom SVG drag rather than a native `<input type="range">` (works well but is slightly fiddly).
10,136 output tokens · claude-opus-4-6 · end_turn
All prompt requirements are implemented correctly — same mass (1000 g), physically plausible densities (19.3 vs 13.0 g/cm³), visually larger alloy crown displaces more water, live stats update, splash particles and Heureka fade-in trigger at full submersion — but mass/volume/density values in the panels are static text rather than dynamically computed, and the slider is a custom SVG drag rather than a native `<input type="range">` (works well but is slightly fiddly).