diff --git a/tests/Browser/CarouselTest.php b/tests/Browser/CarouselTest.php
index 54f548ce..d6e0fe01 100644
--- a/tests/Browser/CarouselTest.php
+++ b/tests/Browser/CarouselTest.php
@@ -70,7 +70,11 @@ const FIRST_ITEM = '#carousel [data-md-carousel-item] >> nth=0';
 
 function carouselShowcase(array $options = [])
 {
+    // Pinned rather than left to the host's own window: at a wide enough viewport the multi-browse
+    // row's 8 items (220px each) leave a remainder the keyline math does not reduce to zero the way
+    // it does here, so "scroll by exactly 2 slots" no longer lands item 2 on the open keyline.
     return visit('/material/carousel', $options)
+        ->resize(1280, 900)
         ->waitForEvent('networkidle')
         ->assertScript("typeof window.Alpine !== 'undefined'");
 }
@@ -164,14 +168,18 @@ it('brings a partly hidden item into focus when it is pressed, and leaves an ope
 });
 
 it('scrolls instantly and leaves every item unmasked under reduced motion', function () {
-    carouselShowcase(['reducedMotion' => 'reduce'])
-        ->assertScript(onCarousel(0, <<<'JS'
-            root.querySelector('[aria-label="Next"]').click()
-            const arrived = at(1)
-            await pause(50)
-            return arrived && items.every((_, i) => inset(i) === 0)
-                && items.every((item) => Math.abs(item.getBoundingClientRect().width - size) < 1.5)
-            JS));
+    // A click, then a separate read-only assertScript: assertScript retries its whole expression
+    // on a false result (this file's own comment above), and a click inside it would fire again on
+    // every retry, drifting the carousel one further item each time and never recovering.
+    $page = carouselShowcase(['reducedMotion' => 'reduce']);
+
+    $page->script(onCarousel(0, 'root.querySelector(\'[aria-label="Next"]\').click()'));
+
+    $page->assertScript(onCarousel(0, <<<'JS'
+        await pause(50)
+        return at(1) && items.every((_, i) => inset(i) === 0)
+            && items.every((item) => Math.abs(item.getBoundingClientRect().width - size) < 1.5)
+        JS));
 });
 
 it('brings an item cut off at the row\'s edge into view when it is pressed under reduced motion', function () {