✓ 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 at top maps to crowns in air, but the label reads "Oben" at top and "Unten" at bottom while the slider value increases downward — however the crown descends as value increases, so top=air/bottom=water is technically correct in behavior, yet the `writing-mode: bt-lr` with `-webkit-appearance: slider-vertical` means the visual thumb at top = value 0 = crowns in air, which is actually correct); animation is ASCII-only with no real fall animation or smooth motion, and the crown rendering logic is broken (crown above water never actually renders correctly due to flawed loop structure).
Slider direction is inverted (min=0 at top maps to crowns in air, but the label reads "Oben" at top and "Unten" at bottom while the slider value increases downward — however the crown descends as value increases, so top=air/bottom=water is technically correct in behavior, yet the `writing-mode: bt-lr` with `-webkit-appearance: slider-vertical` means the visual thumb at top = value 0 = crowns in air, which is actually correct); animation is ASCII-only with no real fall animation or smooth motion, and the crown rendering logic is broken (crown above water never actually renders correctly due to flawed loop structure).