diff --git a/src/wp-includes/js/mce-view.js b/src/wp-includes/js/mce-view.js
index fc6284f..894f301 100644
--- a/src/wp-includes/js/mce-view.js
+++ b/src/wp-includes/js/mce-view.js
@@ -448,8 +448,7 @@ window.wp = window.wp || {};
 		 * @param {Boolean}  rendered Only set for (un)rendered nodes. Optional.
 		 */
 		setIframes: function( head, body, callback, rendered ) {
-			var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver,
-				importStyles = this.type === 'video' || this.type === 'audio' || this.type === 'playlist';
+			var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
 
 			this.getNodes( function( editor, node, content ) {
 				var dom = editor.dom,
@@ -460,20 +459,18 @@ window.wp = window.wp || {};
 				content.innerHTML = '';
 				head = head || '';
 
-				if ( importStyles ) {
-					if ( ! wp.mce.views.sandboxStyles ) {
-						tinymce.each( dom.$( 'link[rel="stylesheet"]', editor.getDoc().head ), function( link ) {
-							if ( link.href && link.href.indexOf( 'skins/lightgray/content.min.css' ) === -1 &&
-								link.href.indexOf( 'skins/wordpress/wp-content.css' ) === -1 ) {
+				if ( ! wp.mce.views.sandboxStyles ) {
+					tinymce.each( dom.$( 'link[rel="stylesheet"]', editor.getDoc().head ), function( link ) {
+						if ( link.href && link.href.indexOf( 'skins/lightgray/content.min.css' ) === -1 &&
+							link.href.indexOf( 'skins/wordpress/wp-content.css' ) === -1 ) {
 
-								styles += dom.getOuterHTML( link ) + '\n';
-							}
-						});
+							styles += dom.getOuterHTML( link ) + '\n';
+						}
+					});
 
-						wp.mce.views.sandboxStyles = styles;
-					} else {
-						styles = wp.mce.views.sandboxStyles;
-					}
+					wp.mce.views.sandboxStyles = styles;
+				} else {
+					styles = wp.mce.views.sandboxStyles;
 				}
 
 				// Seems Firefox needs a bit of time to insert/set the view nodes,
@@ -561,11 +558,10 @@ window.wp = window.wp || {};
 						}
 					}
 
-					if ( importStyles ) {
-						editor.on( 'wp-body-class-change', function() {
-							iframeDoc.body.className = editor.getBody().className;
-						} );
-					}
+					editor.on( 'wp-body-class-change', function() {
+						iframeDoc.body.className = editor.getBody().className;
+					} );
+
 				}, 50 );
 
 				callback && callback.apply( this, arguments );