✓ 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 (value=0/top → crowns in air, but the thumb starts at the top which maps to slider minimum, and dragging down increases the value — this is actually correct directionally in a rotated slider, but the crown animation has no fall/drop physics, mass/volume/density values are static not live-updating, and the vertical slider is a CSS-rotated horizontal input which is a UX compromise.
9,045 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (value=0/top → crowns in air, but the thumb starts at the top which maps to slider minimum, and dragging down increases the value — this is actually correct directionally in a rotated slider, but the crown animation has no fall/drop physics, mass/volume/density values are static not live-updating, and the vertical slider is a CSS-rotated horizontal input which is a UX compromise.