Enforce equal notification card widths across wrapped rows

patterns/notifications.html

@@ -60,5 +60,39 @@
     </div>
   </section>
 
+  <script>
+    const updateNotificationsPatternRowState = () => {
+      document.querySelectorAll('.sg-notifications-pattern').forEach((grid) => {
+        const cards = Array.from(grid.querySelectorAll('.sg-notifications-pattern__card'));
+        grid.classList.remove('sg-notifications-pattern--multi-row');
+        grid.style.removeProperty('--layout-object-card-shared-width');
+
+        if (cards.length <= 1) {
+          return;
+        }
+
+        const firstTop = cards[0].offsetTop;
+        const hasMultipleRows = cards.some((card) => card.offsetTop !== firstTop);
+
+        if (!hasMultipleRows) {
+          return;
+        }
+
+        const firstRowCards = cards.filter((card) => card.offsetTop === firstTop);
+        const referenceCard = firstRowCards[0];
+        if (!referenceCard) {
+          return;
+        }
+
+        const referenceWidth = referenceCard.getBoundingClientRect().width;
+        grid.style.setProperty('--layout-object-card-shared-width', `${referenceWidth}px`);
+        grid.classList.add('sg-notifications-pattern--multi-row');
+      });
+    };
+
+    window.addEventListener('load', updateNotificationsPatternRowState);
+    window.addEventListener('resize', updateNotificationsPatternRowState);
+  </script>
+
 </body>
 </html>