diff --git a/core/misc/dialog/dialog.ajax.js b/core/misc/dialog/dialog.ajax.js
index 0a10b4355d..4a4794e204 100644
--- a/core/misc/dialog/dialog.ajax.js
+++ b/core/misc/dialog/dialog.ajax.js
@@ -117,7 +117,7 @@
     }
     // Set up the wrapper, if there isn't one.
     if (!ajax.selector) {
-      ajax.selector = '#' + $dialog.attr('id');
+      ajax.selector = `#${$dialog.attr('id')}`;
     }
 
     // Use the ajax.js insert command to populate the dialog contents.
diff --git a/core/tests/Drupal/Tests/Core/Render/Element/RenderElementTest.php b/core/tests/Drupal/Tests/Core/Render/Element/RenderElementTest.php
index 205bb6fe5c..df1e040b85 100644
--- a/core/tests/Drupal/Tests/Core/Render/Element/RenderElementTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/Element/RenderElementTest.php
@@ -59,8 +59,6 @@ public function testPreRenderAjaxForm($element, $expected, $url) {
 
     $url_generator = $prophecy->reveal();
     $this->container->set('url_generator', $url_generator);
-
-
     $result = RenderElement::preRenderAjaxForm($element);
 
     $this->assertTrue($result['#ajax_processed']);