waitForEvent('networkidle')
->assertScript("document.readyState === 'complete' && typeof window.Alpine !== 'undefined' && typeof window.Livewire !== 'undefined'");
}
function shellPage(int $width = 1280, int $height = 900, string $path = '/material/shell'): mixed
{
// The window is resized after the page starts loading, and an adaptive rail hears of the new
// width from a media query's change event, which can arrive after the first key press. Both
// of its queries are M3 window size classes: `expanded` (840px) says the rail is standard
// rather than modal, `large` (1200px) that it starts expanded rather than collapsed.
return navigationReady(visit($path)->resize($width, $height))
->assertScript("window.eval(\"(() => { const rail = document.querySelector('[data-md-navigation-rail]'); if (! rail || rail.dataset.mdNavigationRail !== 'adaptive') return true; const state = Alpine.\$data(rail); return state.wide === window.matchMedia('(width >= 840px)').matches && state.roomy === window.matchMedia('(width >= 1200px)').matches; })()\")");
}
/**
* A shell whose page records, while the document is still being parsed — after the rail's
* markup and the stylesheet, before Alpine exists — what and the rail looked like.
* That is what the first paint shows.
*/
function firstPaintProbe(): void
{
Route::middleware('web')->get('/rail-probe', fn () => Blade::render(<<<'BLADE'
@vite(config('livewire-material.showcase.vite'))
@livewireStyles
The page
@livewireScripts
BLADE));
}
function railWidth(int $pixels): string
{
return 'Math.round('.RAIL.".getBoundingClientRect().width) === {$pixels}";
}
it('shows the navigation bar on a compact window and marks the current destination', function () {
shellPage(599, 860)
->assertScript('getComputedStyle('.BOTTOM_BAR.").display !== 'none'")
->assertScript('getComputedStyle('.RAIL_PANEL.").display === 'none'")
->assertScript(BOTTOM_BAR.".querySelectorAll('[data-md-navigation-bar-item]').length === 4")
->assertScript(BOTTOM_BAR.".querySelector('[aria-current=\"page\"]').textContent.includes('Inbox')")
->assertScript('getComputedStyle('.BOTTOM_BAR.".querySelector('[aria-current=\"page\"] [data-md-navigation-indicator]')).backgroundImage !== 'none'")
->assertScript('getComputedStyle('.BOTTOM_BAR.".querySelector('[data-md-navigation-bar-item]:not([aria-current]) [data-md-navigation-indicator]')).backgroundImage === 'none'")
->assertNoJavaScriptErrors();
});
it('collapses the rail across the medium class, icon over label, from its first pixel', function () {
shellPage(600)
->assertScript(railWidth(96))
->assertScript('getComputedStyle('.BOTTOM_BAR.").display === 'none'")
->assertNoJavaScriptErrors();
shellPage(839)
->assertScript(railWidth(96))
->assertScript('getComputedStyle('.BOTTOM_BAR.").display === 'none'")
->assertScript("getComputedStyle(document.querySelector('[data-md-navigation-rail-item]')).flexDirection === 'column'")
->assertScript("getComputedStyle(document.querySelector('[data-md-navigation-rail-heading]')).display === 'none'")
->assertAttribute('[data-md-navigation-rail-menu]', 'aria-expanded', 'false');
});
it('starts the rail collapsed across the expanded class and expands it in the layout', function () {
// 840-1199 is M3's expanded class: a standard rail, collapsed until someone says otherwise,
// whose menu button widens it in place — no scrim, no focus trap, the page beside it live.
shellPage(1199)
->assertScript(railWidth(96))
->assertScript("document.documentElement.hasAttribute('data-rail-auto')")
->assertScript("localStorage.getItem('material-rail') === null")
->assertNoJavaScriptErrors();
$page = shellPage(840)
->assertScript(railWidth(96))
->assertScript('getComputedStyle('.BOTTOM_BAR.").display === 'none'")
->assertAttribute('[data-md-navigation-rail-menu]', 'aria-expanded', 'false');
$page->click('[data-md-navigation-rail-menu]')
->assertScript(railWidth(256))
->assertScript('! '.RAIL.".hasAttribute('data-md-open')")
->assertScript("getComputedStyle(document.querySelector('[data-md-navigation-rail-scrim]')).display === 'none'")
->assertScript("document.getElementById('content').closest('[aria-hidden=\"true\"]') === null")
->assertScript("document.documentElement.getAttribute('data-rail') === 'expanded'")
->assertScript("! document.documentElement.hasAttribute('data-rail-auto')")
->assertScript("localStorage.getItem('material-rail') === 'expanded'")
->assertAttribute('[data-md-navigation-rail-menu]', 'aria-expanded', 'true')
->assertNoJavaScriptErrors();
// The choice outlives the reload, and holds to the top of the class.
navigationReady($page->refresh())->assertScript(railWidth(256));
});
it('morphs the rail header FAB between collapsed (icon only) and extended (with its label)', function () {
$fab = "document.querySelector('[data-md-navigation-rail-fab-row] [data-md-fab]')";
$label = "document.querySelector('[data-md-navigation-rail-fab-row] [data-md-fab] > span')";
$page = shellPage(840)
// Collapsed: the label is clipped to nothing, and the FAB is a plain square icon button —
// navigation-rail.css's [data-md-fab] > span and [data-md-fab][data-md-extended] rules.
->assertScript("getComputedStyle({$label}).opacity === '0'")
->assertScript("getComputedStyle({$label}).maxWidth === '0px'")
->assertScript("Math.round({$fab}.getBoundingClientRect().width) === Math.round({$fab}.getBoundingClientRect().height)");
$page->click('[data-md-navigation-rail-menu]')
// The label's width and the FAB's own shape both spring on the rail's spatial-default
// transition; wait past it for the settled, extended end state.
->wait(0.6)
->assertScript("getComputedStyle({$label}).opacity === '1'")
->assertScript("parseFloat(getComputedStyle({$label}).maxWidth) > 0")
->assertScript("{$fab}.getBoundingClientRect().width > {$fab}.getBoundingClientRect().height")
->assertSee('Compose')
->assertNoJavaScriptErrors();
});
it('expands the rail from large, and keeps it collapsed across a reload from the first paint', function () {
firstPaintProbe();
// 1200 is the first pixel of M3's large class, where the rail starts expanded. The first-paint
// probe runs before the resize, so the harness's own window must be in the same class — it is:
// Playwright opens 1280 wide.
$page = shellPage(1200, 900, '/rail-probe')
->assertScript(railWidth(256))
->assertScript("window.eval('window.firstPaint.width') === '256px'")
->assertAttribute('[data-md-navigation-rail-menu]', 'aria-expanded', 'true');
$page->click('[data-md-navigation-rail-menu]')
->assertScript("document.documentElement.getAttribute('data-rail') === 'collapsed'")
->assertScript("localStorage.getItem('material-rail') === 'collapsed'")
->assertAttribute('[data-md-navigation-rail-menu]', 'aria-expanded', 'false')
->assertScript(railWidth(96));
navigationReady($page->refresh())
->assertScript("window.eval('window.firstPaint.alpine') === 'undefined'")
->assertScript("window.eval('window.firstPaint.rail') === 'collapsed'")
->assertScript("window.eval('window.firstPaint.width') === '96px'")
->assertScript(railWidth(96));
// Extra-large is the same band, and the collapse just chosen still holds there. The same page
// widened: every visit() opens a fresh browser context, whose storage holds no choice.
$page->resize(1600, 900)
->assertScript("window.matchMedia('(width >= 1600px)').matches")
->assertScript("document.documentElement.getAttribute('data-rail') === 'collapsed'")
->assertScript(railWidth(96));
});
it('expands the rail by default at extra-large', function () {
shellPage(1600, 900)
->assertScript(railWidth(256))
->assertScript('getComputedStyle('.BOTTOM_BAR.").display === 'none'")
->assertAttribute('[data-md-navigation-rail-menu]', 'aria-expanded', 'true')
->assertNoJavaScriptErrors();
});
it('opens the modal rail from its menu button below expanded, holding focus until Escape or the scrim', function () {
$page = shellPage(839);
// From the keyboard: WebKit neither focuses a button on click nor returns focus to one that never had it.
$page->script("document.querySelector('[data-md-navigation-rail-menu]').focus()");
$page->keys('[data-md-navigation-rail-menu]', 'Enter')
->assertScript(RAIL.".hasAttribute('data-md-open')")
->assertScript('Math.round('.RAIL_PANEL.'.getBoundingClientRect().width) === 256')
->assertScript(railWidth(96))
->assertScript("getComputedStyle(document.querySelector('[data-md-navigation-rail-heading]')).display !== 'none'")
->assertScript(RAIL_PANEL.'.contains(document.activeElement)')
->assertScript("document.getElementById('content').closest('[aria-hidden=\"true\"]') !== null")
->assertAttribute('[data-md-navigation-rail-menu]', 'aria-expanded', 'true');
$page->keys(':focus', 'Escape')
->assertScript('! '.RAIL.".hasAttribute('data-md-open')")
->assertScript("document.getElementById('content').closest('[aria-hidden=\"true\"]') === null")
->assertScript("document.activeElement === document.querySelector('[data-md-navigation-rail-menu]')");
$page->keys('[data-md-navigation-rail-menu]', 'Enter')
->assertScript(RAIL.".hasAttribute('data-md-open')");
$page->click('[data-md-navigation-rail-scrim]')
->assertScript('! '.RAIL.".hasAttribute('data-md-open')")
->assertScript("localStorage.getItem('material-rail') === null");
});
it('slides the modal rail in on a compact window from the app bar\'s menu button', function () {
$page = shellPage(599, 860);
$page->click('@shell-menu')
->assertScript(RAIL.".hasAttribute('data-md-open')")
->assertScript('getComputedStyle('.RAIL_PANEL.").display === 'flex'")
->assertScript('Math.round('.RAIL_PANEL.'.getBoundingClientRect().left) === 0')
->assertScript(RAIL_PANEL.'.contains(document.activeElement)');
$page->keys(':focus', 'Escape')
->assertScript('! '.RAIL.".hasAttribute('data-md-open')")
->assertScript('getComputedStyle('.RAIL_PANEL.").display === 'none'");
});
it('keeps the rail and the theme through wire:navigate and moves aria-current', function () {
$page = shellPage(1200);
$page->click('[data-md-navigation-rail-menu]')
->assertScript("document.documentElement.getAttribute('data-rail') === 'collapsed'");
$page->script("window.eval(\"Alpine.store('theme').set('dark'); window.samePage = true\")");
$page->click('[data-md-navigation-rail-panel] a[href$="/material/shell/starred"]')
->assertSeeIn('@shell-page', 'This is the starred page.')
->assertScript("window.eval('window.samePage') === true")
->assertScript("document.documentElement.getAttribute('data-rail') === 'collapsed'")
->assertScript("document.documentElement.getAttribute('data-theme') === 'dark'")
->assertScript(railWidth(96))
->assertScript("document.querySelector('[data-md-navigation-rail-panel] [aria-current=\"page\"]').getAttribute('href').endsWith('/material/shell/starred')")
->assertScript("document.querySelectorAll('[data-md-navigation-rail-panel] [aria-current=\"page\"]').length === 1")
->assertNoJavaScriptErrors();
});
it('skips to the content', function () {
$page = shellPage();
$page->assertScript("document.querySelector('a[href], button, input, select, textarea, [tabindex]:not([tabindex=\"-1\"])').matches('[data-md-skip-link]')");
// Safari and WebKit leave links out of the Tab order, so focus it directly.
$page->script("document.querySelector('[data-md-skip-link]').focus()");
$page->assertScript("getComputedStyle(document.querySelector('[data-md-skip-link]')).position === 'fixed'")
->assertVisible('[data-md-skip-link]');
$page->keys('[data-md-skip-link]', 'Enter')
->assertScript("location.hash === '#content'")
->assertScript("document.activeElement === document.getElementById('content')");
});
it('moves an app bar\'s content under a safe area an application sets', function () {
$row = "Math.round(document.querySelector('[data-md-app-bar] [data-md-app-bar-row]').getBoundingClientRect().top)";
$page = navigationReady(visit('/material'));
$top = (int) $page->script($row);
$page->script("document.documentElement.style.setProperty('--material-safe-top', '47px')");
$page->assertScript("{$row} === ".($top + 47))
->assertNoJavaScriptErrors();
});
it('lifts the snackbar and the page above something docked on the phone\'s bar', function () {
$snackbarBottom = "Math.round(parseFloat(getComputedStyle(document.querySelector('[x-data=\"materialSnackbar\"]')).bottom))";
$contentPadding = "Math.round(parseFloat(getComputedStyle(document.getElementById('content')).paddingBottom))";
$page = shellPage(599, 860);
$snackbar = (int) $page->script($snackbarBottom);
$content = (int) $page->script($contentPadding);
expect($content)->toBe(64)->and($snackbar)->toBe(80);
$page->script("document.documentElement.style.setProperty('--material-bottom-extra', '40px')");
$page->assertScript("{$snackbarBottom} === 120")
->assertScript("{$contentPadding} === 104");
});
/**
* A page for the navigation bar and rail props the shell's own adaptive rail never exercises:
* `tall`, `hide-on-scroll` (with a pinned snackbar), a narrow centred rail, and a rail that hides
* when collapsed. A wide, fixed viewport throughout, so none of M3's breakpoints interfere with
* what each example's own props already decide (docs/plans/material-3-browser-tests.md § Navigation).
*/
function navigationExtrasProbe(): mixed
{
Route::middleware('web')->get('/navigation-extras-probe', fn () => Blade::render(<<<'BLADE'
@vite(config('livewire-material.showcase.vite'))
@livewireStyles
@livewireScripts
BLADE));
return navigationReady(visit('/navigation-extras-probe')->resize(1000, 900));
}
it('draws the tall navigation bar, icon over label at every width', function () {
$page = navigationExtrasProbe();
$page->assertScript("Math.round(document.querySelector('#tall-bar [data-md-navigation-bar-items]').getBoundingClientRect().height) === 80")
->assertScript("getComputedStyle(document.querySelector('#tall-bar [data-md-navigation-pill]')).flexDirection === 'column'")
->assertNoJavaScriptErrors();
});
it('hides the bar on a scroll down and never while a pinned snackbar is on screen', function () {
$page = navigationExtrasProbe();
$hidden = "document.querySelector('#hide-bar [data-md-navigation-bar]').hasAttribute('data-md-hidden')";
$page->script('window.scrollTo(0, 400)');
$page->assertScript("{$hidden} === true")
->assertNoJavaScriptErrors();
// Back to the top brings it back, as a fresh scroll-down would; pin a snackbar first.
$page->script('window.scrollTo(0, 0)');
$page->assertScript("{$hidden} === false");
$page->script("materialToast('Pinned', { sticky: true })");
$page->assertScript("document.querySelector('[data-md-toast-snackbar]')?.textContent.includes('Pinned')");
$page->script('window.scrollTo(0, 400)');
$page->assertScript("{$hidden} === false")
->assertNoJavaScriptErrors();
});
it('draws the narrow collapsed width and centres the destinations', function () {
$page = navigationExtrasProbe();
$page->assertScript("Math.round(document.querySelector('#narrow-rail [data-md-navigation-rail]').getBoundingClientRect().width) === 80")
->assertScript("getComputedStyle(document.querySelector('#narrow-rail [data-md-navigation-rail-destinations]')).justifyContent === 'safe center'")
->assertNoJavaScriptErrors();
});
it('takes a rail out of the layout entirely when it hides collapsed, and back over the page', function () {
$page = navigationExtrasProbe();
$rail = "document.querySelector('#hiding-rail [data-md-navigation-rail]')";
$railWidth = "Math.round({$rail}.getBoundingClientRect().width)";
$page->assertScript("{$railWidth} > 200")
->click('#hiding-rail [data-md-navigation-rail-menu]')
->assertScript("{$railWidth} === 0")
->assertScript("! {$rail}.hasAttribute('data-md-open')");
// The only way back: an application's own menu button calling $store.rail.show().
$page->click('#open-hiding-rail')
->assertScript("{$rail}.hasAttribute('data-md-open')")
->assertScript("getComputedStyle(document.querySelector('#hiding-rail [data-md-navigation-rail-panel]')).display === 'flex'")
->assertNoJavaScriptErrors();
});
it('takes an adaptive rail out of the layout across the expanded class when it hides collapsed, standing again from large', function () {
$page = navigationExtrasProbe();
$rail = "document.querySelector('#adaptive-hiding-rail [data-md-navigation-rail]')";
$railWidth = "Math.round({$rail}.getBoundingClientRect().width)";
// `medium` (600-839): the window collapses the rail, not the visitor, so M3's "collapsed rail
// may never hide" holds even with hide-when-collapsed set — it stays at its collapsed width.
$page->resize(839, 900)
->assertScript("{$railWidth} === 96")
->assertScript("! {$rail}.hasAttribute('data-md-open')")
->assertScript("document.documentElement.hasAttribute('data-rail-auto')")
->assertNoJavaScriptErrors();
// `expanded` (840-1199): nothing chosen yet, so the rail is away rather than shown collapsed.
$page->resize(840, 900)
->assertScript("{$railWidth} === 0")
->assertScript("! {$rail}.hasAttribute('data-md-open')")
->assertScript("document.documentElement.hasAttribute('data-rail-auto')")
->assertNoJavaScriptErrors();
$page->resize(1199, 900)
->assertScript("{$railWidth} === 0")
->assertScript("document.documentElement.hasAttribute('data-rail-auto')");
// `large` (1200+): M3 starts an adaptive rail expanded by default, so it stands in the layout
// again rather than staying away.
$page->resize(1200, 900)
->assertScript("{$railWidth} === 256")
->assertScript("! {$rail}.hasAttribute('data-md-open')")
->assertScript("document.documentElement.hasAttribute('data-rail-auto')")
->assertNoJavaScriptErrors();
});
/**
* One rail in the given mode, whose footer holds two lines an application styles by the rail's
* value with style queries — the way `--md-navigation-rail-value` is meant to be read. An inline
* script after the rail records the value and the lines' display while the document is still being
* parsed, before Alpine exists: what the first paint shows.
*/
function railValueProbe(string $mode, int $width = 1280): mixed
{
Route::middleware('web')->get('/rail-value-probe/{mode}', fn (string $mode) => Blade::render(<<<'BLADE'
@vite(config('livewire-material.showcase.vite'))
@livewireStyles
Signed in as Ada
A
Outside the rail
@livewireScripts
BLADE, ['mode' => $mode]));
return navigationReady(visit("/rail-value-probe/{$mode}")->resize($width, 900));
}
const RAIL_VALUE = 'getComputedStyle('.RAIL.").getPropertyValue('--md-navigation-rail-value').trim()";
function railShows(string $line): string
{
return "getComputedStyle(document.querySelector('[data-test=\"{$line}\"]')).display !== 'none'";
}
it('publishes a fixed rail\'s value from the first paint, for style queries in its content', function () {
railValueProbe('collapsed')
->assertScript("window.firstPaint.alpine === 'undefined'")
->assertScript("window.firstPaint.value === 'collapsed'")
->assertScript("window.firstPaint.expandedOnly === 'none' && window.firstPaint.collapsedOnly !== 'none'")
->assertScript(RAIL_VALUE." === 'collapsed'")
->assertScript('! '.railShows('expanded-only'))
->assertScript(railShows('collapsed-only'))
// Outside a rail the property is unset, so neither value's query matches.
->assertScript("getComputedStyle(document.querySelector('[data-test=\"outside\"]')).getPropertyValue('--md-navigation-rail-value') === ''")
->assertNoJavaScriptErrors();
railValueProbe('expanded')
->assertScript("window.firstPaint.value === 'expanded'")
->assertScript("window.firstPaint.expandedOnly !== 'none' && window.firstPaint.collapsedOnly === 'none'")
->assertScript(RAIL_VALUE." === 'expanded'")
->assertScript(railShows('expanded-only'))
->assertScript('! '.railShows('collapsed-only'))
->assertNoJavaScriptErrors();
});
it('moves an adaptive rail\'s value with the window and the menu button, in step with its width', function () {
$page = railValueProbe('adaptive', 839)
->assertScript(railWidth(96))
->assertScript(RAIL_VALUE." === 'collapsed'")
->assertScript('! '.railShows('expanded-only'));
// `large`: M3 starts an adaptive rail expanded while nothing is chosen.
$page->resize(1200, 900)
->assertScript(railWidth(256))
->assertScript(RAIL_VALUE." === 'expanded'")
->assertScript(railShows('expanded-only'))
->assertScript('! '.railShows('collapsed-only'));
// `expanded`: collapsed until the menu button widens it in place.
$page->resize(840, 900)
->assertScript(RAIL_VALUE." === 'collapsed'")
->click('[data-md-navigation-rail-menu]')
->assertScript(railWidth(256))
->assertScript(RAIL_VALUE." === 'expanded'")
->assertScript(railShows('expanded-only'))
->assertNoJavaScriptErrors();
});
it('reads expanded while a modal rail is open over the page, and collapsed once it closes', function () {
$page = railValueProbe('modal', 1000)
->assertScript(RAIL_VALUE." === 'collapsed'")
->assertScript('! '.railShows('expanded-only'));
$page->click('#open-rail')
->assertScript(RAIL.".hasAttribute('data-md-open')")
->assertScript(RAIL_VALUE." === 'expanded'")
->assertScript(railShows('expanded-only'))
->assertScript('! '.railShows('collapsed-only'));
$page->keys('[data-md-navigation-rail-panel]', 'Escape')
->assertScript('! '.RAIL.".hasAttribute('data-md-open')")
->assertScript(RAIL_VALUE." === 'collapsed'")
->assertScript('! '.railShows('expanded-only'))
->assertNoJavaScriptErrors();
});
/**
* Closes a rail with the given script and reports whether, sampling every few ms in the page
* itself, it was ever caught part-way: the whole close in one round trip, since a separate
* `script` and `assertScript` apiece already take as long as the 200ms exit (see ContainmentTest's
* scrim fades).
*/
function caughtMidClose(mixed $page, string $close, string $partWay): bool
{
return $page->script(<< {
{$close}
for (let i = 0; i < 60; i++) {
if ({$partWay}) return true
await new Promise((resolve) => setTimeout(resolve, 5))
}
return false
})()
JS) === true;
}
/**
* Opened and done opening: no transition left on the element. Firefox creates a transition on its
* next refresh tick, so straight after the change its computed style already reads the end value
* while the entry has not begun, and a close then would start from where the entry did.
*/
function settled(string $element): string
{
return "{$element}.getAnimations().length === 0";
}
/** Still drawn, and strictly between resting at the window's edge and gone past it. */
function slidingOut(string $panel): string
{
return "(getComputedStyle({$panel}).display !== 'none' && {$panel}.getBoundingClientRect().left < -2 && {$panel}.getBoundingClientRect().right > 2)";
}
it('slides the compact rail out on close, rather than making it vanish', function () {
$page = shellPage(599, 860)
->click('@shell-menu')
->assertScript(RAIL.".hasAttribute('data-md-open')")
->assertScript(settled(RAIL_PANEL).' && Math.round('.RAIL_PANEL.'.getBoundingClientRect().left) === 0');
expect(caughtMidClose($page, "document.querySelector('[data-md-navigation-rail-scrim]').click()", slidingOut(RAIL_PANEL)))->toBeTrue();
$page->assertScript('getComputedStyle('.RAIL_PANEL.").display === 'none'")
->assertScript('! '.RAIL.".hasAttribute('data-md-closing')")
->assertNoJavaScriptErrors();
});
it('slides a rail that hides when collapsed out on close, rather than making it vanish', function () {
$page = navigationExtrasProbe();
$rail = "document.querySelector('#hiding-rail [data-md-navigation-rail]')";
$panel = "{$rail}.querySelector(':scope > [data-md-navigation-rail-panel]')";
$page->click('#hiding-rail [data-md-navigation-rail-menu]')
->assertScript("Math.round({$rail}.getBoundingClientRect().width) === 0")
->click('#open-hiding-rail')
->assertScript("{$rail}.hasAttribute('data-md-open')")
->assertScript(settled($panel)." && Math.round({$panel}.getBoundingClientRect().left) === 0 && Math.round({$panel}.getBoundingClientRect().width) === 256");
expect(caughtMidClose($page, "{$rail}.querySelector(':scope > [data-md-navigation-rail-scrim]').click()", slidingOut($panel)))->toBeTrue();
$page->assertScript("getComputedStyle({$panel}).display === 'none'")
->assertScript("Math.round({$rail}.getBoundingClientRect().width) === 0")
->assertNoJavaScriptErrors();
});
it('fades a modal rail\'s scrim out on close while the rail stands collapsed in the layout', function () {
$scrim = RAIL.".querySelector(':scope > [data-md-navigation-rail-scrim]')";
$page = railValueProbe('modal', 1000)
->click('#open-rail')
->assertScript(RAIL.".hasAttribute('data-md-open')")
->assertScript(settled($scrim)." && getComputedStyle({$scrim}).opacity === '1'");
$fading = "(getComputedStyle({$scrim}).display !== 'none' && parseFloat(getComputedStyle({$scrim}).opacity) > 0.02 && parseFloat(getComputedStyle({$scrim}).opacity) < 0.98)";
expect(caughtMidClose($page, "{$scrim}.click()", $fading))->toBeTrue();
// The panel goes straight back into the layout: only the scrim was over the page.
$page->assertScript("getComputedStyle({$scrim}).display === 'none'")
->assertScript('getComputedStyle('.RAIL_PANEL.").position === 'sticky'")
->assertScript(railWidth(96))
->assertNoJavaScriptErrors();
});