✓ 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 (min=0/top=air is correct conceptually but CSS rotate(-90deg) maps the low end to the top visually, so dragging up increases immersion — directionally backwards UX); mass, volume, and density values are static labels, not live-updating data-value elements, so live_value_mass/volume/density fail the "live" criterion.
9,826 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (min=0/top=air is correct conceptually but CSS rotate(-90deg) maps the low end to the top visually, so dragging up increases immersion — directionally backwards UX); mass, volume, and density values are static labels, not live-updating data-value elements, so live_value_mass/volume/density fail the "live" criterion.