Fix Firefox: wheels, dark shadows, theme glass, smooth jumps, tri-state

Found by driving Firefox 158 with real pointer, wheel and key input.

- Time picker wheels used padding to reach the last rows. Firefox leaves
  bottom padding out of the scrollable area, so the last rows were
  unreachable and the 24H/AM/PM wheel could not scroll at all. Spacer
  pseudo-elements replace the padding.
- Wheels can now be dragged with a mouse or pen, with inertia, a rubber-band
  at the ends and a spring back. Touch is left to the platform.
- Theme changes no longer use a page-wide view transition. The snapshot
  could not blur what sits behind frosted glass, so every frosted surface
  went clear for the length of the cross-fade.
- Dark shadows were invisible: black on a near-black canvas, with a deep
  negative spread tucking the blur under the element. The dark canvas is
  lifted, the shadows are stronger and the spreads milder.
- Same-page links now travel (scroll-behavior: smooth, motion permitting).
- data-nv-tristate: a checkbox that cycles unchecked, checked, partial; the
  browser can display a partial state but a click can never choose it.
- Button groups show their pressed segment.

GUIDELINES.md gains the cross-engine rules these defects taught, and makes
Firefox the first browser to verify in.

check.py, build.py and build.py --check pass.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
Nexoniarz 2026-10-28 09:50:40 +01:00
commit 65d81481bd
9 changed files with 253 additions and 48 deletions

View file

@ -15,6 +15,12 @@
consistent between appearances: an ambient contact shadow that keeps the
edge crisp, a soft penumbra for the spread, and an umbra that only appears
once a surface is genuinely far from the canvas.
Two things keep a shadow visible, and both have failed before. The soft
layers use only a mild negative spread: a deep one tucks the blur under the
element and leaves almost nothing outside it. And the canvas has to be
lighter than the shadow colour — black cannot darken black — which is why the
dark canvas is not the darkest value it could be.
========================================================================== */
:root {
@ -23,27 +29,27 @@
--nv-elevation-1:
0 1px 1px var(--nv-color-shadow-ambient),
0 2px 4px -1px var(--nv-color-shadow-penumbra),
0 6px 14px -8px var(--nv-color-shadow-umbra);
0 6px 14px -5px var(--nv-color-shadow-umbra);
--nv-elevation-2:
0 1px 1px var(--nv-color-shadow-ambient),
0 3px 6px -2px var(--nv-color-shadow-penumbra),
0 10px 20px -10px var(--nv-color-shadow-umbra);
0 10px 20px -7px var(--nv-color-shadow-umbra);
--nv-elevation-3:
0 1px 2px var(--nv-color-shadow-ambient),
0 6px 12px -4px var(--nv-color-shadow-penumbra),
0 18px 36px -12px var(--nv-color-shadow-umbra);
0 18px 36px -9px var(--nv-color-shadow-umbra);
--nv-elevation-4:
0 1px 2px var(--nv-color-shadow-ambient),
0 10px 20px -6px var(--nv-color-shadow-penumbra),
0 30px 60px -16px var(--nv-color-shadow-umbra);
0 30px 60px -12px var(--nv-color-shadow-umbra);
--nv-elevation-5:
0 2px 3px var(--nv-color-shadow-ambient),
0 16px 32px -8px var(--nv-color-shadow-penumbra),
0 44px 88px -20px var(--nv-color-shadow-umbra);
0 44px 88px -16px var(--nv-color-shadow-umbra);
/* --- Inset ---------------------------------------------------------------
Recessed surfaces: fields, wells, tracks, pressed controls. */