diff -u b/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php b/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php
--- b/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php
@@ -389,6 +389,7 @@
 
     $data['html without links'] = ["Test without links but with\r\nsome special characters", 'http://example.com', FALSE];
     $data['html with html entity'] = ["Test without links but with
\nsome special characters", 'http://example.com', FALSE];
+    $data['html with carriage return in tag'] = ["<a\rhref='/node'>My link</a>", 'http://example.com', '<a href="http://example.com/node">My link</a>'];
 
     return $data;
   }