diff --git a/core/lib/Drupal/Core/Entity/EntityListBuilder.php b/core/lib/Drupal/Core/Entity/EntityListBuilder.php
index b7b1347..8e98736 100644
--- a/core/lib/Drupal/Core/Entity/EntityListBuilder.php
+++ b/core/lib/Drupal/Core/Entity/EntityListBuilder.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\Core\Entity;
 
+use Drupal\Component\Serialization\Json;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\StringTranslation\TranslationInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -123,6 +124,13 @@ protected function getDefaultOperations(EntityInterface $entity) {
       $operations['delete'] = array(
         'title' => $this->t('Delete'),
         'weight' => 100,
+        'attributes' => array(
+          'class' => array('use-ajax'),
+          'data-accepts' => 'application/vnd.drupal-modal',
+          'data-dialog-options' => Json::encode(array(
+            'width' => 'auto',
+          )),
+        ),
       ) + $entity->urlInfo('delete-form')->toArray();
     }
 
@@ -173,6 +181,10 @@ public function buildOperations(EntityInterface $entity) {
     $build = array(
       '#type' => 'operations',
       '#links' => $this->getOperations($entity),
+      // Allow links to use modals.
+      '#attached' => array(
+        'library' => array('core/drupal.ajax'),
+      ),
     );
 
     return $build;
diff --git a/core/lib/Drupal/Core/Form/ConfirmFormHelper.php b/core/lib/Drupal/Core/Form/ConfirmFormHelper.php
index 1b1fa30..3ff5247 100644
--- a/core/lib/Drupal/Core/Form/ConfirmFormHelper.php
+++ b/core/lib/Drupal/Core/Form/ConfirmFormHelper.php
@@ -62,6 +62,10 @@ public static function buildCancelLink(ConfirmFormInterface $form, Request $requ
 
     $link['#type'] = 'link';
     $link['#title'] = $form->getCancelText();
+    $link['#attributes'] = array(
+      'class' => array('dialog-cancel'),
+    );
+
     return $link;
   }
 
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigEntityListTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigEntityListTest.php
index 71b7a4d..ba4fa19 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigEntityListTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigEntityListTest.php
@@ -62,6 +62,10 @@ function testList() {
       'delete' => array (
         'title' => t('Delete'),
         'weight' => 100,
+        'attributes' => array(
+          'class' => array('use-ajax'),
+          'data-accepts' => 'application/vnd.drupal-modal',
+        ),
       ) + $entity->urlInfo('delete-form')->toArray(),
     );
 
@@ -130,6 +134,10 @@ function testList() {
       'delete' => array(
         'title' => t('Delete'),
         'weight' => 100,
+        'attributes' => array(
+          'class' => array('use-ajax'),
+          'data-accepts' => 'application/vnd.drupal-modal',
+        ),
       ) + $entity->urlInfo('delete-form')->toArray(),
     );