✓ 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 — the element uses CSS `transform: rotate(-90deg)` on a horizontal range input, meaning dragging toward the visual "top" actually increases the value, but the slider min=0 maps to crowns in air and max=100 to crowns in water, which is semantically correct in code yet the physical thumb movement (drag up = increase value on a rotated slider) is counterintuitive and likely inverted in feel; physics values (ρ_gold=19.32, ρ_fake=13.15, V derived correctly, buoyancy in Newtons) are accurate and the gilded crown visibly displaces more water, but the water-rise scale factor is arbitrary pixels rather than a physically grounded mapping.
13,484 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted — the element uses CSS `transform: rotate(-90deg)` on a horizontal range input, meaning dragging toward the visual "top" actually increases the value, but the slider min=0 maps to crowns in air and max=100 to crowns in water, which is semantically correct in code yet the physical thumb movement (drag up = increase value on a rotated slider) is counterintuitive and likely inverted in feel; physics values (ρ_gold=19.32, ρ_fake=13.15, V derived correctly, buoyancy in Newtons) are accurate and the gilded crown visibly displaces more water, but the water-rise scale factor is arbitrary pixels rather than a physically grounded mapping.