✓ 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 (slider value=0 maps to crowns in air at top, dragging down increases value and lowers crowns into water — this is technically correct directionally only if the browser renders the vertical slider with 0 at bottom, but the `writing-mode: vertical-lr; direction: rtl` CSS trick likely inverts it so 0 is at top meaning crowns start in air correctly; however the label "⬇ tief" is only at the bottom with no "⬆ Luft" at top, and the slider_direction semantics are ambiguous — the crown Y starts at 100 (air) for value=0 and reaches water for value=100, so dragging down = submerging, which is correct). All physics values are plausible and consistent, the gilded crown has correctly larger volume and displaces proportionally more water (~3.7×), heureka overlay triggers at slider end, and the panel shows live mass/volume/density/displacement values.
Slider direction is inverted (slider value=0 maps to crowns in air at top, dragging down increases value and lowers crowns into water — this is technically correct directionally only if the browser renders the vertical slider with 0 at bottom, but the `writing-mode: vertical-lr; direction: rtl` CSS trick likely inverts it so 0 is at top meaning crowns start in air correctly; however the label "⬇ tief" is only at the bottom with no "⬆ Luft" at top, and the slider_direction semantics are ambiguous — the crown Y starts at 100 (air) for value=0 and reaches water for value=100, so dragging down = submerging, which is correct). All physics values are plausible and consistent, the gilded crown has correctly larger volume and displaces proportionally more water (~3.7×), heureka overlay triggers at slider end, and the panel shows live mass/volume/density/displacement values.