Issue #3278415 by nod_, lauriii, catch, Wim Leers, longwave, xjm, claudiu.cristea: Remove usages of the JavaScript ES6 build step, the build step itself, and associated dev dependencies

1 files changed, 13 insertions, 15 deletions

diff --git a/core/misc/jquery.tabbable.shim.js b/core/misc/jquery.tabbable.shim.js
index bd4174214c2e..6820cd1b1ff7 100644
--- a/core/misc/jquery.tabbable.shim.js
+++ b/core/misc/jquery.tabbable.shim.js
@@ -1,30 +1,28 @@
 /**
-* DO NOT EDIT THIS FILE.
-* See the following change record for more information,
-* https://www.drupal.org/node/2815083
-* @preserve
-**/
+ * @file
+ * Defines a backwards-compatible shim for the jQuery UI :tabbable selector.
+ */
 
-(($, Drupal, _ref) => {
-  let {
-    isTabbable
-  } = _ref;
+(($, Drupal, { isTabbable }) => {
   $.extend($.expr[':'], {
     tabbable(element) {
       Drupal.deprecationError({
-        message: 'The :tabbable selector is deprecated in Drupal 9.2.0 and will be removed in Drupal 11.0.0. Use the core/tabbable library instead. See https://www.drupal.org/node/3183730'
+        message:
+          'The :tabbable selector is deprecated in Drupal 9.2.0 and will be removed in Drupal 11.0.0. Use the core/tabbable library instead. See https://www.drupal.org/node/3183730',
       });
 
+      // The tabbable library considers the summary element tabbable, and also
+      // considers a details element without a summary tabbable. The jQuery UI
+      // :tabbable selector does not. This is due to those element types being
+      // inert in IE/Edge.
+      // @see https://allyjs.io/data-tables/focusable.html
       if (element.tagName === 'SUMMARY' || element.tagName === 'DETAILS') {
         const tabIndex = element.getAttribute('tabIndex');
-
         if (tabIndex === null || tabIndex < 0) {
           return false;
         }
       }
-
       return isTabbable(element);
-    }
-
+    },
   });
-})(jQuery, Drupal, window.tabbable);
\ No newline at end of file
+})(jQuery, Drupal, window.tabbable);