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Size the loading indicator and publish the rail's value

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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>
This commit is contained in:
Andreas Reinhold / reini
2026-09-16 12:06:16 +02:00
co-authored by Claude Opus 5
parent 24eb811f34
commit f2a3c4d056
13 changed files with 228 additions and 30 deletions
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tests/Feature/Components/LoadingTest.php
+11 -1
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@@ -19,13 +19,23 @@ it('is 48px in the primary colour unless the caller sizes or colours it', functi
$css = ComponentStylesheet::read('loading');
expect($css->declarations('[data-md-loading]'))
->toMatchArray(['inline-size' => '48px', 'block-size' => '48px', 'color' => 'var(--md-sys-color-primary)'])
->toMatchArray(['inline-size' => 'var(--md-loading-size, 48px)', 'block-size' => 'var(--md-loading-size, 48px)', 'color' => 'var(--md-sys-color-primary)'])
// A caller's class lands on the root untouched, and outranks the package's layer.
->and((string) $this->blade('<x-loading class="app-upload-spinner" label="Uploading" />'))
->toContain('class="app-upload-spinner"')
->toContain('aria-label="Uploading"');
});
it('draws a size from M3\'s responsive range, 24 to 240px', function () {
$this->blade('<x-loading size="96" />')->assertSee('style="--md-loading-size: 96px"', false);
$this->blade('<x-loading size="24" />')->assertSee('style="--md-loading-size: 24px"', false);
$this->blade('<x-loading size="240" />')->assertSee('style="--md-loading-size: 240px"', false);
foreach (['16', '480', 'large'] as $outside) {
$this->blade("<x-loading size=\"{$outside}\" />")->assertDontSee('--md-loading-size', false);
}
});
it('sits on a primary-container circle when contained', function () {
expect((string) $this->blade('<x-loading contained />'))->toContain('data-md-contained')
->and((string) $this->blade('<x-loading />'))->not->toContain('data-md-contained')