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ui: crossfade page changes with cross-document view transitions #63

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Merged
acoshift merged 1 commit into from
Jul 2, 2026
Merged

ui: crossfade page changes with cross-document view transitions #63

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18 changes: 18 additions & 0 deletions assets/style/_base.scss
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Original file line number Diff line number Diff line change
Expand Up @@ -48,3 +48,21 @@ body {
border-radius: var(--radius-sm);
}
.skip-link:focus { left: 0.5rem; }

/* Page-change animation (cross-document view transitions): same-origin
* page loads crossfade instead of flashing (Chrome 126+ / Safari 18.2+;
* other browsers keep the instant swap). Navbar + sidebar carry their own
* snapshots (_layout.scss) so the app shell stays put. group(*) included:
* its geometry animation would otherwise run at the UA default 250ms and
* hold the transition open after the fades end. */
@media (prefers-reduced-motion: no-preference) {
@view-transition {
navigation: auto;
}

::view-transition-group(*),
::view-transition-old(*),
::view-transition-new(*) {
animation-duration: var(--timing-fast);
}
}
7 changes: 7 additions & 0 deletions assets/style/_layout.scss
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Expand Up @@ -15,6 +15,10 @@
backdrop-filter: saturate(140%) blur(12px);
border-bottom: 1px solid var(--color-ink-line);
color: var(--color-content-inv);
/* Own view-transition snapshot: the app shell stays put while the page
* crossfades (_base.scss). The backdrop blur isn't part of the element's
* own paint, so it drops out for the 120ms transition — imperceptible. */
view-transition-name: navbar;
}

.navbar-brand {
Expand Down Expand Up @@ -143,6 +147,9 @@ html.dark .navbar-theme-toggle .icon-moon { display: inline-block; }
padding: 1.75rem 0.75rem 3rem 1.25rem;
border-right: 1px solid var(--color-line);
background-color: var(--color-base);
/* Own view-transition snapshot: stays put during page changes; only the
* active item crossfades. */
view-transition-name: sidebar;
}
.sidebar-mobile-nav {
display: none;
Expand Down