diff --git a/core/modules/datetime_range/tests/src/Functional/DateRangeFieldTest.php b/core/modules/datetime_range/tests/src/Functional/DateRangeFieldTest.php
index 23ba8fa..ebeb4b8 100644
--- a/core/modules/datetime_range/tests/src/Functional/DateRangeFieldTest.php
+++ b/core/modules/datetime_range/tests/src/Functional/DateRangeFieldTest.php
@@ -170,16 +170,6 @@ public function testDateRangeField() {
       $output = $this->renderTestEntity($id);
       $this->assertContains($expected, $output, new FormattableMarkup('Formatted date field using daterange_custom format displayed as %expected.', ['%expected' => $expected]));
 
-      // Test that allowed markup in custom format is preserved and XSS is
-      // removed.
-      $this->displayOptions['settings']['date_format'] = '\\<\\s\\t\\r\\o\\n\\g\\>m/d/Y\\<\\/\\s\\t\\r\\o\\n\\g\\>\\<\\s\\c\\r\\i\\p\\t\\>\\a\\l\\e\\r\\t\\(\\S\\t\\r\\i\\n\\g\\.\\f\\r\\o\\m\\C\\h\\a\\r\\C\\o\\d\\e\\(\\8\\8\\,\\8\\3\\,\\8\\3\\)\\)\\<\\/\\s\\c\\r\\i\\p\\t\\>';
-      entity_get_display($this->field->getTargetEntityTypeId(), $this->field->getTargetBundle(), 'full')
-        ->setComponent($field_name, $this->displayOptions)
-        ->save();
-      $expected = '<strong>' . $start_date->format('m/d/Y') . '</strong>alert(String.fromCharCode(88,83,83)) - <strong>' . $end_date->format('m/d/Y') . '</strong>alert(String.fromCharCode(88,83,83))';
-      $output = $this->renderTestEntity($id);
-      $this->assertContains($expected, $output, new FormattableMarkup('Formatted date field using daterange_custom format displayed as %expected.', ['%expected' => $expected]));
-
       // Test formatters when start date and end date are the same
       $this->drupalGet('entity_test/add');
       $value = '2012-12-31 00:00:00';