✓ 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=air/top maps to crown in air, but the slider label says "OBEN=top" yet slider min=0 at top means dragging down increases depth — functionally acceptable but the writing-mode/direction combo means the physical top of the slider thumb corresponds to 0/air, which is actually correct; however the label "OBEN=Eintauchen" is semantically confusing); ASCII art is well-crafted with rising water, splash, and live physics data, but the animation is text-based which limits smoothness.
Slider direction is inverted (value 0=air/top maps to crown in air, but the slider label says "OBEN=top" yet slider min=0 at top means dragging down increases depth — functionally acceptable but the writing-mode/direction combo means the physical top of the slider thumb corresponds to 0/air, which is actually correct; however the label "OBEN=Eintauchen" is semantically confusing); ASCII art is well-crafted with rising water, splash, and live physics data, but the animation is text-based which limits smoothness.