✓ 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 at top labeled "LUFT", but crownPos increases with depthPercent which maps 0→top correctly — however the label "WASSER" is at bottom and slider starts at 0 mapping to no submersion, which is directionally correct in behavior but the writing-mode CSS causes the visual slider to render inverted in most browsers); no fall animation or splash effects; ASCII art rendering has a visual bug where water overwrites the crown glyphs entirely rather than showing crown-in-water; gilded crown correctly displaces more water with solid physics values (gold 19.3, alloy 13.0, same 1000g mass).
Slider direction is inverted (value=0 at top labeled "LUFT", but crownPos increases with depthPercent which maps 0→top correctly — however the label "WASSER" is at bottom and slider starts at 0 mapping to no submersion, which is directionally correct in behavior but the writing-mode CSS causes the visual slider to render inverted in most browsers); no fall animation or splash effects; ASCII art rendering has a visual bug where water overwrites the crown glyphs entirely rather than showing crown-in-water; gilded crown correctly displaces more water with solid physics values (gold 19.3, alloy 13.0, same 1000g mass).