✓ 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 means crowns in air, value=100 at bottom means submerged — label says "Oben: Luft / Unten: Wasser" which matches intent, but the slider's writing-mode bt-lr means the physical top handle corresponds to value=100/water, making the direction wrong); ASCII/Unicode art rendering is functional but animations are entirely absent — no fall, no smooth transition, and the splash is cosmetic random noise rather than a true effect.
Slider direction is inverted (value=0 at top means crowns in air, value=100 at bottom means submerged — label says "Oben: Luft / Unten: Wasser" which matches intent, but the slider's writing-mode bt-lr means the physical top handle corresponds to value=100/water, making the direction wrong); ASCII/Unicode art rendering is functional but animations are entirely absent — no fall, no smooth transition, and the splash is cosmetic random noise rather than a true effect.