✓ 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 label "Luft" (air) is at the top and "Wasser" (water) at the bottom, but slider min=0 maps to air and slider value increases downward on screen yet the crown moves into water as value increases, which is technically correct in behavior but the CSS `transform: rotate(-90deg)` on a standard horizontal slider means dragging right (increasing value) visually moves the thumb downward toward "Wasser," making direction consistent — however a proper `writing-mode: vertical-lr` vertical range is not used and cross-browser reliability is questionable; all other features (splash, ripples, Eureka overlay with confetti, live data panels, comparison bars, water rise) are well-implemented with solid physics (gold 19.32 g/cm³, gilded 11.0 g/cm³, same 1000 g mass).
13,055 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted — the label "Luft" (air) is at the top and "Wasser" (water) at the bottom, but slider min=0 maps to air and slider value increases downward on screen yet the crown moves into water as value increases, which is technically correct in behavior but the CSS `transform: rotate(-90deg)` on a standard horizontal slider means dragging right (increasing value) visually moves the thumb downward toward "Wasser," making direction consistent — however a proper `writing-mode: vertical-lr` vertical range is not used and cross-browser reliability is questionable; all other features (splash, ripples, Eureka overlay with confetti, live data panels, comparison bars, water rise) are well-implemented with solid physics (gold 19.32 g/cm³, gilded 11.0 g/cm³, same 1000 g mass).