✓ 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
Slider direction is inverted (dragging down = crown descends into water, but SLIDER_MIN_Y=top maps t=0 to crown in air while bottom maps t=1 to crown submerged — semantically correct in behavior but the thumb starts at the top meaning "air", which is actually correct; however ArrowUp raises slider which submerges crowns more, contradicting natural expectation), and mass/density values are static text rather than dynamically updated, though physics constants (19.3 vs 13.0 g/cm³, same 1000g mass, ALLOY_VOLUME ~76.9 cm³ vs GOLD_VOLUME ~51.8 cm³) are all physically accurate and the gilded crown visually displaces more water.
9,475 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (dragging down = crown descends into water, but SLIDER_MIN_Y=top maps t=0 to crown in air while bottom maps t=1 to crown submerged — semantically correct in behavior but the thumb starts at the top meaning "air", which is actually correct; however ArrowUp raises slider which submerges crowns more, contradicting natural expectation), and mass/density values are static text rather than dynamically updated, though physics constants (19.3 vs 13.0 g/cm³, same 1000g mass, ALLOY_VOLUME ~76.9 cm³ vs GOLD_VOLUME ~51.8 cm³) are all physically accurate and the gilded crown visually displaces more water.