✓ 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 = air is correct in label, but HTML range input at visual top maps slider min to air which is semantically correct yet the rotated slider's thumb starts at left=bottom visually due to CSS rotation — and critically, mass/volume/density values are static text, not live-updating data-value elements, failing the live readout requirement for three of the four metrics.
9,650 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (value=0/top = air is correct in label, but HTML range input at visual top maps slider min to air which is semantically correct yet the rotated slider's thumb starts at left=bottom visually due to CSS rotation — and critically, mass/volume/density values are static text, not live-updating data-value elements, failing the live readout requirement for three of the four metrics.