✓ 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 is labeled "Tief"/deep at top, crowns start in air, but the vertical orientation maps top=0=air which is correct directionally — however the label reads "Tief" at top and "e" at bottom suggesting confused labeling); more critically, `writing-mode: bt-lr` with min=0/max=100 and value=0 means the thumb starts at the bottom in most browsers, placing crowns in air at bottom-thumb-position which is inverted UX; splash effects fire continuously on every slider tick rather than only on water entry, diluting the effect.
Slider direction is inverted (value=0 is labeled "Tief"/deep at top, crowns start in air, but the vertical orientation maps top=0=air which is correct directionally — however the label reads "Tief" at top and "e" at bottom suggesting confused labeling); more critically, `writing-mode: bt-lr` with min=0/max=100 and value=0 means the thumb starts at the bottom in most browsers, placing crowns in air at bottom-thumb-position which is inverted UX; splash effects fire continuously on every slider tick rather than only on water entry, diluting the effect.