diff --git a/src/Toolkit/kits/shadcn/navigation-menu/assets/controllers/navigation_menu_controller.js b/src/Toolkit/kits/shadcn/navigation-menu/assets/controllers/navigation_menu_controller.js
index e02b422f169..74ddb38f071 100644
--- a/src/Toolkit/kits/shadcn/navigation-menu/assets/controllers/navigation_menu_controller.js
+++ b/src/Toolkit/kits/shadcn/navigation-menu/assets/controllers/navigation_menu_controller.js
@@ -158,17 +158,18 @@ export default class extends Controller {
     }
 
     // Anchor to the trigger's inline-start, but shift so the content never overflows the viewport.
+    // The edge is rounded to a whole pixel: text on a fractional pixel is not always antialiased the same way.
     #viewportInlineStart(navRect, itemRect, width, rtl) {
         const margin = 8;
         if (rtl) {
             const right = Math.max(width + margin, Math.min(itemRect.right, window.innerWidth - margin));
 
-            return navRect.right - right;
+            return navRect.right - Math.round(right);
         }
 
         const left = Math.max(margin, Math.min(itemRect.left, window.innerWidth - margin - width));
 
-        return left - navRect.left;
+        return Math.round(left) - navRect.left;
     }
 
     #setOpen(open, activeItem = null) {
diff --git a/src/Toolkit/kits/shadcn/navigation-menu/tests/navigation-menu.spec.ts b/src/Toolkit/kits/shadcn/navigation-menu/tests/navigation-menu.spec.ts
index 9b38066cc6a..db03e316ba8 100644
--- a/src/Toolkit/kits/shadcn/navigation-menu/tests/navigation-menu.spec.ts
+++ b/src/Toolkit/kits/shadcn/navigation-menu/tests/navigation-menu.spec.ts
@@ -88,6 +88,31 @@ describeRecipe('shadcn/navigation-menu', () => {
         await expect(page.getByRole('link', { name: /Introduction/ })).toBeVisible();
     });
 
+    for (const { example, trigger, edge } of [
+        { example: 'default', trigger: 'Getting started', edge: 'left' },
+        { example: 'rtl', trigger: 'ابدأ', edge: 'right' },
+    ] as const) {
+        test(`aligns the ${edge} edge of the panel on a whole pixel in the ${example} example`, async ({
+            page,
+            gotoExample,
+        }) => {
+            await gotoExample(`shadcn/navigation-menu/${example}`);
+            const viewport = page.locator('[data-slot="navigation-menu-viewport"][data-state="open"]');
+
+            await page.getByRole('button', { name: trigger }).click();
+            await expect(viewport).toBeVisible();
+            await viewport
+                .locator('..')
+                .evaluate((positioner) =>
+                    Promise.all(positioner.getAnimations({ subtree: true }).map((animation) => animation.finished))
+                );
+
+            const box = (await viewport.boundingBox())!;
+            const position = 'left' === edge ? box.x : box.x + box.width;
+            expect(position).toBe(Math.round(position));
+        });
+    }
+
     test('switches to another item at once while one is open', async ({ page, gotoExample }) => {
         await gotoExample('shadcn/navigation-menu/default', { timers: 'fake' });
         const gettingStarted = page.getByRole('button', { name: 'Getting started' });
diff --git a/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-after-move-light.png b/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-after-move-light.png
index 60a5b18a1e1..7470fbd9979 100644
Binary files a/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-after-move-light.png and b/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-after-move-light.png differ
diff --git a/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-dark.png b/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-dark.png
index 50ba0134518..9b81fdf9c7e 100644
Binary files a/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-dark.png and b/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-dark.png differ
diff --git a/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-light.png b/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-light.png
index 60a5b18a1e1..7470fbd9979 100644
Binary files a/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-light.png and b/src/Toolkit/kits/shadcn/navigation-menu/tests/screenshots/default-open-light.png differ