✓ 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 maps to crowns in air (top of range), but the slider thumb sits at the bottom visually due to vertical-lr/rtl CSS, so dragging down raises the value and sinks the crowns, which is the opposite of the specified top=air/bottom=water UX convention; otherwise a polished, physically sound demo.
Slider direction is inverted — value=0 maps to crowns in air (top of range), but the slider thumb sits at the bottom visually due to vertical-lr/rtl CSS, so dragging down raises the value and sinks the crowns, which is the opposite of the specified top=air/bottom=water UX convention; otherwise a polished, physically sound demo.