Initial Drupal 11 with DDEV setup

web/core/misc/details-aria.js

@@ -0,0 +1,31 @@
+/**
+ * @file
+ * Add aria attribute handling for details and summary elements.
+ */
+
+(function ($, Drupal) {
+  /**
+   * Handles `aria-expanded` and `aria-pressed` attributes on details elements.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.detailsAria = {
+    attach() {
+      $(once('detailsAria', 'body')).on(
+        'click.detailsAria',
+        'summary',
+        (event) => {
+          const $summary = $(event.currentTarget);
+          const open =
+            $(event.currentTarget.parentNode).attr('open') === 'open'
+              ? 'false'
+              : 'true';
+
+          $summary.attr({
+            'aria-expanded': open,
+          });
+        },
+      );
+    },
+  };
+})(jQuery, Drupal);