✓ 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 (CSS rotate(-90deg) on a horizontal range makes visual bottom = slider min = air, but the label says "down = submerge" while the thumb physically moves up to increase depth, causing UX confusion); no true fall animation (crowns teleport linearly with no drop physics or entry event).
7,805 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (CSS rotate(-90deg) on a horizontal range makes visual bottom = slider min = air, but the label says "down = submerge" while the thumb physically moves up to increase depth, causing UX confusion); no true fall animation (crowns teleport linearly with no drop physics or entry event).