diff --git a/wp-includes/embed-functions.php b/wp-includes/embed-functions.php
index 549ff9545c..739f0270e2 100644
--- a/wp-includes/embed-functions.php
+++ b/wp-includes/embed-functions.php
@@ -478,7 +478,7 @@ function get_post_embed_html( $width, $height, $post = null ) {
 		 * and edit wp-embed.js directly.
 		 */
 		$output .=<<<JS
-		!function(a,b){"use strict";function c(){if(!e){e=!0;var a,c,d,f,g=-1!==navigator.appVersion.indexOf("MSIE 10"),h=!!navigator.userAgent.match(/Trident.*rv:11\./),i=b.querySelectorAll("iframe.wp-embedded-content"),j=b.querySelectorAll("blockquote.wp-embedded-content");for(c=0;c<j.length;c++)j[c].style.display="none";for(c=0;c<i.length;c++)d=i[c],d.style.display="",d.getAttribute("data-secret")||(f=Math.random().toString(36).substr(2,10),d.src+="#?secret="+f,d.setAttribute("data-secret",f)),(g||h)&&d.getAttribute("security")&&(a=d.cloneNode(!0),a.removeAttribute("security"),d.parentNode.replaceChild(a,d))}}var d=b.querySelector&&a.addEventListener,e=!1;a.wp=a.wp||{},a.wp.receiveEmbedMessage||(a.wp.receiveEmbedMessage=function(c){var d=c.data;if(d.secret||d.message||d.value){var e,f,g,h,i,j=b.querySelectorAll('iframe[data-secret="'+d.secret+'"]'),k=b.querySelectorAll('blockquote[data-secret="'+d.secret+'"]');for(e=0;e<k.length;e++)k[e].style.display="none";for(e=0;e<j.length;e++)f=j[e],f.style.display="","height"===d.message&&(g=parseInt(d.value,10),g>1e3?g=1e3:200>~~g&&(g=200),f.height=g),"link"===d.message&&(h=b.createElement("a"),i=b.createElement("a"),h.href=f.getAttribute("src"),i.href=d.value,i.host===h.host&&b.activeElement===f&&(a.top.location.href=d.value))}},d&&(a.addEventListener("message",a.wp.receiveEmbedMessage,!1),b.addEventListener("DOMContentLoaded",c,!1),a.addEventListener("load",c,!1)))}(window,document);
+		!function(a,b){"use strict";function c(){if(!e){e=!0;var a,c,d,f,g=-1!==navigator.appVersion.indexOf("MSIE 10"),h=!!navigator.userAgent.match(/Trident.*rv:11\./),i=b.querySelectorAll("iframe.wp-embedded-content"),j=b.querySelectorAll("blockquote.wp-embedded-content");for(c=0;c<j.length;c++)j[c].style.display="none";for(c=0;c<i.length;c++)if(d=i[c],d.style.display="",!d.getAttribute("data-secret")){if(f=Math.random().toString(36).substr(2,10),d.src+="#?secret="+f,d.setAttribute("data-secret",f),g||h)a=d.cloneNode(!0),a.removeAttribute("security"),d.parentNode.replaceChild(a,d)}else;}}var d=!1,e=!1;if(b.querySelector)if(a.addEventListener)d=!0;if(a.wp=a.wp||{},!a.wp.receiveEmbedMessage)if(a.wp.receiveEmbedMessage=function(c){var d=c.data;if(d.secret||d.message||d.value){var e,f,g,h,i,j=b.querySelectorAll('iframe[data-secret="'+d.secret+'"]'),k=b.querySelectorAll('blockquote[data-secret="'+d.secret+'"]');for(e=0;e<k.length;e++)k[e].style.display="none";for(e=0;e<j.length;e++){if(f=j[e],f.style.display="","height"===d.message){if(g=parseInt(d.value,10),g>1e3)g=1e3;else if(200>~~g)g=200;f.height=g}if("link"===d.message)if(h=b.createElement("a"),i=b.createElement("a"),h.href=f.getAttribute("src"),i.href=d.value,i.host===h.host)if(b.activeElement===f)a.top.location.href=d.value}}},d)a.addEventListener("message",a.wp.receiveEmbedMessage,!1),b.addEventListener("DOMContentLoaded",c,!1),a.addEventListener("load",c,!1)}(window,document);
 JS;
 	}
 	$output .= "\n//--><!]]>";
diff --git a/wp-includes/js/wp-embed.js b/wp-includes/js/wp-embed.js
index 8223102381..50471c714b 100644
--- a/wp-includes/js/wp-embed.js
+++ b/wp-includes/js/wp-embed.js
@@ -1,9 +1,15 @@
 (function ( window, document ) {
 	'use strict';
 
-	var supportedBrowser = ( document.querySelector && window.addEventListener ),
+	var supportedBrowser = false,
 		loaded = false;
 
+		if ( document.querySelector ) {
+			if ( window.addEventListener ) {
+				supportedBrowser = true;
+			}
+		}
+
 	window.wp = window.wp || {};
 
 	if ( !! window.wp.receiveEmbedMessage ) {
@@ -50,8 +56,10 @@
 				targetURL.href = data.value;
 
 				/* Only continue if link hostname matches iframe's hostname. */
-				if ( targetURL.host === sourceURL.host && document.activeElement === source ) {
-					window.top.location.href = data.value;
+				if ( targetURL.host === sourceURL.host ) {
+					if ( document.activeElement === source ) {
+						window.top.location.href = data.value;
+					}
 				}
 			}
 		}
@@ -77,15 +85,17 @@
 			source = iframes[ i ];
 			source.style.display = '';
 
-			if ( !source.getAttribute( 'data-secret' ) ) {
-				/* Add secret to iframe */
-				secret = Math.random().toString( 36 ).substr( 2, 10 );
-				source.src += '#?secret=' + secret;
-				source.setAttribute( 'data-secret', secret );
+			if ( source.getAttribute( 'data-secret' ) ) {
+				continue;
 			}
 
+			/* Add secret to iframe */
+			secret = Math.random().toString( 36 ).substr( 2, 10 );
+			source.src += '#?secret=' + secret;
+			source.setAttribute( 'data-secret', secret );
+
 			/* Remove security attribute from iframes in IE10 and IE11. */
-			if ( ( isIE10 || isIE11 ) && !!source.getAttribute( 'security' ) ) {
+			if ( ( isIE10 || isIE11 ) ) {
 				iframeClone = source.cloneNode( true );
 				iframeClone.removeAttribute( 'security' );
 				source.parentNode.replaceChild( iframeClone, source );
diff --git a/wp-includes/js/wp-embed.min.js b/wp-includes/js/wp-embed.min.js
index d249f41d8a..aed371f911 100644
--- a/wp-includes/js/wp-embed.min.js
+++ b/wp-includes/js/wp-embed.min.js
@@ -1 +1 @@
-!function(a,b){"use strict";function c(){if(!e){e=!0;var a,c,d,f,g=-1!==navigator.appVersion.indexOf("MSIE 10"),h=!!navigator.userAgent.match(/Trident.*rv:11\./),i=b.querySelectorAll("iframe.wp-embedded-content"),j=b.querySelectorAll("blockquote.wp-embedded-content");for(c=0;c<j.length;c++)j[c].style.display="none";for(c=0;c<i.length;c++)d=i[c],d.style.display="",d.getAttribute("data-secret")||(f=Math.random().toString(36).substr(2,10),d.src+="#?secret="+f,d.setAttribute("data-secret",f)),(g||h)&&d.getAttribute("security")&&(a=d.cloneNode(!0),a.removeAttribute("security"),d.parentNode.replaceChild(a,d))}}var d=b.querySelector&&a.addEventListener,e=!1;a.wp=a.wp||{},a.wp.receiveEmbedMessage||(a.wp.receiveEmbedMessage=function(c){var d=c.data;if(d.secret||d.message||d.value){var e,f,g,h,i,j=b.querySelectorAll('iframe[data-secret="'+d.secret+'"]'),k=b.querySelectorAll('blockquote[data-secret="'+d.secret+'"]');for(e=0;e<k.length;e++)k[e].style.display="none";for(e=0;e<j.length;e++)f=j[e],f.style.display="","height"===d.message&&(g=parseInt(d.value,10),g>1e3?g=1e3:200>~~g&&(g=200),f.height=g),"link"===d.message&&(h=b.createElement("a"),i=b.createElement("a"),h.href=f.getAttribute("src"),i.href=d.value,i.host===h.host&&b.activeElement===f&&(a.top.location.href=d.value))}},d&&(a.addEventListener("message",a.wp.receiveEmbedMessage,!1),b.addEventListener("DOMContentLoaded",c,!1),a.addEventListener("load",c,!1)))}(window,document);
\ No newline at end of file
+!function(a,b){"use strict";function c(){if(!e){e=!0;var a,c,d,f,g=-1!==navigator.appVersion.indexOf("MSIE 10"),h=!!navigator.userAgent.match(/Trident.*rv:11\./),i=b.querySelectorAll("iframe.wp-embedded-content"),j=b.querySelectorAll("blockquote.wp-embedded-content");for(c=0;c<j.length;c++)j[c].style.display="none";for(c=0;c<i.length;c++)if(d=i[c],d.style.display="",!d.getAttribute("data-secret")){if(f=Math.random().toString(36).substr(2,10),d.src+="#?secret="+f,d.setAttribute("data-secret",f),g||h)a=d.cloneNode(!0),a.removeAttribute("security"),d.parentNode.replaceChild(a,d)}else;}}var d=!1,e=!1;if(b.querySelector)if(a.addEventListener)d=!0;if(a.wp=a.wp||{},!a.wp.receiveEmbedMessage)if(a.wp.receiveEmbedMessage=function(c){var d=c.data;if(d.secret||d.message||d.value){var e,f,g,h,i,j=b.querySelectorAll('iframe[data-secret="'+d.secret+'"]'),k=b.querySelectorAll('blockquote[data-secret="'+d.secret+'"]');for(e=0;e<k.length;e++)k[e].style.display="none";for(e=0;e<j.length;e++){if(f=j[e],f.style.display="","height"===d.message){if(g=parseInt(d.value,10),g>1e3)g=1e3;else if(200>~~g)g=200;f.height=g}if("link"===d.message)if(h=b.createElement("a"),i=b.createElement("a"),h.href=f.getAttribute("src"),i.href=d.value,i.host===h.host)if(b.activeElement===f)a.top.location.href=d.value}}},d)a.addEventListener("message",a.wp.receiveEmbedMessage,!1),b.addEventListener("DOMContentLoaded",c,!1),a.addEventListener("load",c,!1)}(window,document);
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6ee51f97da..8731c4fe08 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-beta4-35707';
+$wp_version = '4.4-beta4-35708';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.