A rail that was open over the page left it on `transition: … display …
allow-discrete`: the compact adaptive rail's slide-out, the slide-out of
a rail that hides when collapsed, and every rail scrim's fade. Firefox
does not transition `display`, even with `allow-discrete` (Chrome 117
and Safari 18 do), so there the panel and the scrim vanished on the
first frame. Unlike the sheets' scrims these are drawn by attribute
rules on `data-md-open`, not `x-show`, so Alpine had nothing to hold.
navigation.js now marks a rail that closes `data-md-closing` — `sheet`
when the panel leaves the window, `scrim` when it stands in the layout
again — and drops it once the panel's `translate` and the scrim's
`opacity` transitions have finished (at once under reduced motion, or
when the rail opens again). navigation-rail.css keeps what is leaving
displayed, and a sliding panel in its open geometry, while the
attribute is set, and no longer transitions `display` anywhere, so
Chrome and Safari do not hold a second time. The view sets it from
`x-effect`, beside the `x-bind` that drops `data-md-open`, so both
attributes change in one flush: a `$watch` a microtask later let a
style read in between settle the scrim as already hidden. The collapsed
branches and `--md-navigation-rail-value` are untouched.
NavigationTest samples each exit part-way in the page (the compact
slide, the hide-when-collapsed slide, a modal rail's scrim) and checks
it ends hidden; all three fail on main in Firefox and pass in Chrome,
Firefox and Safari. They wait for the entry to finish first: Firefox
creates a transition on its next refresh tick, so straight after a
change its computed style already reads the end value. NavigationRailTest
pins the holds and that no rule transitions `display`.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Two gaps found rewriting the Boost skill for 2.0's plain CSS, each
closed the way M3 describes it.
`<x-loading size="96">`: M3 gives the loading indicator a responsive
size, 48dp by default and flexible from 24 to 240dp ("never exceed that
range"), with the container and the active shape in a fixed ratio. The
size had no prop, so an application wrote a width and height of its own;
`size` now takes a whole number of px in that range, written as
`--md-loading-size`, and the SVG keeps the 48:38 ratio as it scales. A
value outside the range is ignored, as `<x-icon>` and `<x-shape>` ignore
theirs, and an application's own width and height still win.
`--md-navigation-rail-value`: M3 Expressive's rail has two values,
collapsed and expanded (Compose's WideNavigationRailValue), and content
in a rail follows it. Without a hook an application copied the rail's
seven conditions — mode, `data-rail`, `data-rail-auto`, open, and the
window band — out of navigation-rail.css. The rail now publishes the
answer from the same branches that narrow it: `expanded` by default,
`collapsed` wherever it is drawn collapsed, so a style query in the
application's CSS switches at the first paint and at the same moment
as the rail's own items. A rail open over a scrim reads `expanded`, and
outside a rail the property is unset. A JS attribute would have missed
the first paint; a width container query would have lagged the collapse
animation.
Style queries on a custom property need Firefox 151, so the browser
floor moves from Firefox 147 to 151 (README, the CI note, UPGRADE's new
2.1.0 section); Chrome 125 and Safari 18.4 are unchanged.
Browser tests pin both in Chrome, Firefox and Safari: the indicator's
drawn box at 96 and 32px, and the rail's value — with a style query
acting on it — at the first paint for fixed modes, across the window
classes and the menu button for an adaptive rail, and open and closed
for a modal one. NavigationRailTest pins the value in each of the five
collapsed branches.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Plan step 39 (part 4). With Tailwind gone the Workbench's Vite build
still turns every `:dir(rtl)` into a long `:lang()` list (its own CSS
minifier, not Tailwind's doing — confirmed by rebuilding and grepping
the output). Every RTL mirror rule across the eleven stylesheets that
had one now selects `:is([dir='rtl'], [dir='rtl'] *)` instead, matching
`:dir(rtl)`'s own specificity (one pseudo-class) and its inherited
"this element or a descendant of one carrying the attribute" reach; the
built CSS now keeps the selector as written (no `:lang(` or `:dir(` left).
RTL browser tests drop the `lang="ar"` workaround the old rewrite
needed (ContainmentTest's side-sheet probe, LayoutTest's shared
layoutPage() helper) and set only dir="rtl"; CarouselTest's probe
already did. Feature tests asserting the selector's literal text
(Progress, Overlay, Menu, ListDetail, Icon, Carousel) updated to match.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
Plan step 37 review. The collapsed rail FAB's gap and minimum width tied
with fab.css's extended-size and collapse-on-scroll rules at three
attributes and won only by coming after them. A deduplicating bundle
keeps that order (navigation-rail.css imports fab.css), but a build that
repeats a shared stylesheet need not: all.css imports fab.css again after
the scaffold has reached the rail, and the Workbench's Tailwind entry
inlines every occurrence. Doubling [data-md-extended] settles it by
specificity, as the flat shadow already was, so the order no longer
matters.
A scan of every component and layout stylesheet pair for same-layer,
same-property ties on a shared hook found no other override that relies
on order: the remaining ties are on mutually exclusive elements or sit
behind an import edge.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
Plan step 36, navigation review. navigation-rail.css claimed each FAB
override beats fab.css by specificity alone; the collapsed FAB's gap
and minimum width tie with fab.css's extended-size rules and win by
order, which the file's own import of fab.css guarantees. The rail
view pointed at one file for the collapsed conditions that four files
write out. UPGRADE.md now says applications lose the `rail-collapsed:`
variant the development skill used to teach.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
Plan step 36 (navigation group, second batch): <x-navigation-rail>'s,
<x-navigation-rail-item>'s and <x-navigation-rail-section>'s class
lists move into navigation-rail.css, navigation-rail-item.css and
navigation-rail-section.css, keyed on data-md-navigation-rail (the
mode, data-md-width, data-md-align, data-md-hide-when-collapsed,
data-md-divider, data-md-fill, data-md-open), data-md-navigation-rail-
item (data-md-active) and data-md-navigation-rail-section. Every
Tailwind wrapper class in the view — the menu row's centring padding,
the FAB row, the two swapped menu glyphs, the brand's visibility —
becomes a hook the stylesheet draws instead; the menu button itself
renders the shared md-state-layer/md-focus-ring/md-touch-target
classes (N-01's pattern) since it draws its own layer on itself, not a
child. `<x-icon>` and `<x-badge>` take size and floating props instead
of size/position classes; a small data-md-navigation-icon hook (the
shared navigation-item.css) replaces the ad hoc "relative inline-flex"
wrapper a floating badge anchors to.
`rail-collapsed` (a Tailwind @custom-variant, forbidden in Phase F) is
reproduced as plain selectors, branch for branch: the three width-
independent conditions (a fixed collapsed mode; a collapsible rail the
visitor collapsed and not open; a modal rail not open) merge into one
:where() group, provably the same match set as three separate rules
since :where(A, B, C) on an element is true exactly when :where(A) or
:where(B) or :where(C) is; the four width-gated conditions stay
separate media blocks, since CSS cannot merge different `@media`
queries. Every rem length becomes px, since these are dp-based M3
tokens, not a text measure (unlike <x-pane>'s rem widths). The FAB
overrides for a rail's header — elevation 0 (N-03), morphing into an
extended FAB instead of swapping two by display (N-23) — move from
unlayered into this file's own material.components, like toolbar.css's
FAB override: fab.css's `[data-md-fab]` is one attribute, so a doubled
selector here always outranks it without needing to sit outside the
layer.
navigation.js: the arriving-indicator stylesheet and every code comment
follow the new hooks; resources/css/components/navigation.css is
deleted (nothing imports it any more) and its line in tailwind.css with
it. Behaviour is unchanged except one thing Tailwind's `rail-collapsed:`
variant could do that plain CSS in this shape cannot: it is gone for
consuming applications too, since the definition lived only in the file
this commit removes. The development skill's guidance for it is
rewritten to point at navigation-rail.css's own selectors instead of
teaching a Tailwind variant that no longer exists.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
