diff -u b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
--- b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
+++ b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
@@ -35,12 +35,9 @@
 
     $this->drupalGet($entity->url());
 
-    $this->assertSession()->elementExists('css', 'audio');
-    $this->assertSession()->elementAttributeContains('css', 'audio', 'controls', 'controls');
-
-    $this->assertSession()->elementExists('css', 'audio > source');
-    $this->assertSession()->elementAttributeContains('css', 'audio > source', 'src', file_create_url($file->getFileUri()));
-    $this->assertSession()->elementAttributeContains('css', 'audio > source', 'type', 'audio/mpeg');
+    $file_url = file_create_url($file->getFileUri());
+    $this->assertSession()->elementExists('css', 'audio[controls="controls"]');
+    $this->assertSession()->elementExists('css', "audio > source[src='$file_url'][type='audio/mpeg']");
   }
 
 }
diff -u b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
--- b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
+++ b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
@@ -35,12 +35,9 @@
 
     $this->drupalGet($entity->url());
 
-    $this->assertSession()->elementExists('css', 'video');
-    $this->assertSession()->elementAttributeContains('css', 'video', 'controls', 'controls');
-
-    $this->assertSession()->elementExists('css', 'video > source');
-    $this->assertSession()->elementAttributeContains('css', 'video > source', 'src', file_create_url($file->getFileUri()));
-    $this->assertSession()->elementAttributeContains('css', 'video > source', 'type', 'video/mp4');
+    $file_url = file_create_url($file->getFileUri());
+    $this->assertSession()->elementExists('css', 'video[controls="controls"]');
+    $this->assertSession()->elementExists('css', "video > source[src='$file_url'][type='video/mp4']");
   }
 
 }