Index: src/wp-includes/js/mediaelement/wp-mediaelement.css
===================================================================
--- src/wp-includes/js/mediaelement/wp-mediaelement.css	(revision 30868)
+++ src/wp-includes/js/mediaelement/wp-mediaelement.css	(working copy)
@@ -33,6 +33,31 @@
 	border-radius: 0;
 }
 
+.mejs-controls .mejs-offscreen {
+	clip: rect(1px, 1px, 1px, 1px);
+	position: absolute;
+}
+
+.mejs-controls a:focus > .mejs-offscreen {
+	background-color: #f1f1f1;
+	border-radius: 3px;
+	box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
+	clip: auto;
+	color: #21759b;
+	display: block;
+	font-size: 14px;
+	font-weight: bold;
+	height: auto;
+	line-height: normal;
+	padding: 15px 23px 14px;
+	position: absolute;
+	left: 0;
+	top: 15px;
+	text-decoration: none;
+	text-transform: none;
+	width: auto;
+}
+
 .mejs-overlay-loading {
 	background: transparent;
 }