Ticket #24896: 24896.2.diff

wp-includes/js/mediaelement/wp-mediaelement.css

@@ -8 +8 @@
 
 .mejs-controls .mejs-time-rail .mejs-time-current {
         background: #d54e21;
-}
- No newline at end of file
+}
+
+.me-cannotplay {
+        width: auto !important;
+}

wp-includes/media.php

@@ -910 +910 @@
                 'loop'     => $loop,
                 'autoplay' => $autoplay,
                 'preload'  => $preload,
+                'style'    => 'width: 100%',
         );
 
         // These ones should just be omitted altogether if they are blank