✓ 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 is visually rotated via CSS transform (not a native vertical input) and its direction is inverted — dragging toward the bottom of the page increases the value but the label says "down = into water" while the HTML range min=0/max=100 with rotation means the top of the rendered slider corresponds to max (water), not air, making directional logic ambiguous and confusing in practice.
9,823 output tokens · claude-opus-4-6 · end_turn
Slider is visually rotated via CSS transform (not a native vertical input) and its direction is inverted — dragging toward the bottom of the page increases the value but the label says "down = into water" while the HTML range min=0/max=100 with rotation means the top of the rendered slider corresponds to max (water), not air, making directional logic ambiguous and confusing in practice.