diff -u b/core/modules/outside_in/js/off-canvas.es6.js b/core/modules/outside_in/js/off-canvas.es6.js
--- b/core/modules/outside_in/js/off-canvas.es6.js
+++ b/core/modules/outside_in/js/off-canvas.es6.js
@@ -10,8 +10,10 @@
  */
 
 (function ($, Drupal, debounce, displace) {
-  // The minimum width to use body displace needs to match the width at which
-  // the off-canvas dialog will be 100% width. @see outside_in.module.css
+  /**
+   * The minimum width to use body displace needs to match the width at which
+   * the off-canvas dialog will be 100% width. @see outside_in.module.css
+   */
   const minDisplaceWidth = 768;
 
   /**
diff -u b/core/modules/outside_in/js/outside_in.es6.js b/core/modules/outside_in/js/outside_in.es6.js
--- b/core/modules/outside_in/js/outside_in.es6.js
+++ b/core/modules/outside_in/js/outside_in.es6.js
@@ -97,7 +97,10 @@
         $(quickEditItemSelector)
           .not(contextualItemsSelector)
           .on('click.outsidein', (e) => {
-            // For all non-contextual links or the contextual QuickEdit link close the off-canvas dialog.
+            /**
+             * For all non-contextual links or the contextual QuickEdit link
+             * close the off-canvas dialog.
+             */
             if (!$(e.target).parent().hasClass('contextual') || $(e.target).parent().hasClass('quickedit')) {
               closeOffCanvas();
             }
@@ -156,20 +159,26 @@
    * @listens event:drupalContextualLinkAdded
    */
   $(document).on('drupalContextualLinkAdded', (event, data) => {
-    // Bind Ajax behaviors to all items showing the class.
-    // @todo Fix contextual links to work with use-ajax links in
-    //    https://www.drupal.org/node/2764931.
+    /**
+     * Bind Ajax behaviors to all items showing the class.
+     * @todo Fix contextual links to work with use-ajax links in
+     * https://www.drupal.org/node/2764931.
+     */
     Drupal.attachBehaviors(data.$el[0]);
-
-    // Bind a listener to all 'Quick edit' links for blocks
-    // Click "Edit" button in toolbar to force Contextual Edit which starts
-    // Settings Tray edit mode also.
+    /**
+     * Bind a listener to all 'Quick edit' links for blocks. Click "Edit" button
+     * in toolbar to force Contextual Edit which starts Settings Tray edit
+     * mode also.
+     */
     data.$el.find(blockConfigureSelector)
       .on('click.outsidein', () => {
         if (!isInEditMode()) {
           $(toggleEditSelector).trigger('click').trigger('click.outside_in');
         }
-        // Always disable QuickEdit regardless of whether "EditMode" was just enabled.
+        /**
+         * Always disable QuickEdit regardless of whether "EditMode" was just
+         * enabled.
+         */
         disableQuickEdit();
       });
   });