diff --git a/core/modules/system/tests/modules/ajax_test/src/Controller/AjaxTestController.php b/core/modules/system/tests/modules/ajax_test/src/Controller/AjaxTestController.php
index 1897719f615..d02d26a49b8 100644
--- a/core/modules/system/tests/modules/ajax_test/src/Controller/AjaxTestController.php
+++ b/core/modules/system/tests/modules/ajax_test/src/Controller/AjaxTestController.php
@@ -331,7 +331,7 @@ class AjaxTestController {
       'not-wrapped' => 'not-wrapped',
       'comment-string-not-wrapped' => '<!-- COMMENT -->comment-string-not-wrapped',
       'comment-not-wrapped' => '<!-- COMMENT --><div class="comment-not-wrapped">comment-not-wrapped</div>',
-      'svg' => '<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><rect x="0" y="0" height="10" width="10" fill="green"/></svg>',
+      'svg' => '<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><rect x="0" y="0" height="10" width="10" fill="green"></rect></svg>',
       'empty' => '',
     ];
     $render_multiple_root = [
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
index 87ec2d21087..dafb55ffd8e 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
@@ -102,7 +102,7 @@ class AjaxTest extends WebDriverTestBase {
       'not-wrapped' => 'not-wrapped',
       'comment-string-not-wrapped' => '<!-- COMMENT -->comment-string-not-wrapped',
       'comment-not-wrapped' => '<!-- COMMENT --><div class="comment-not-wrapped">comment-not-wrapped</div>',
-      'svg' => '<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><rect x="0" y="0" height="10" width="10" fill="green"/></svg>',
+      'svg' => '<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><rect x="0" y="0" height="10" width="10" fill="green"></rect></svg>',
       'empty' => '',
     ];
     $render_multiple_root_unwrapper = [