Patch-Magento_PageCache-M2.1.0-element-js-error-fix.patch

--- view/frontend/web/js/page-cache.js	2016-12-08 21:22:42.000000000 +0300
+++ view/frontend/web/js/page-cache.js	2017-05-04 10:26:54.000000000 +0300
@@ -24,6 +24,18 @@
          * @param {jQuery} element - Comment holder
          */
         (function lookup(element) {
+            var iframeHostName;
+
+            // prevent cross origin iframe content reading
+            if ($(element).prop('tagName') === 'IFRAME') {
+                iframeHostName = $('<a>').prop('href', $(element).prop('src'))
+                                             .prop('hostname');
+
+                if (window.location.hostname !== iframeHostName) {
+                    return [];
+                }
+            }
+
             $(element).contents().each(function (index, el) {
                 switch (el.nodeType) {
                     case 1: // ELEMENT_NODE
@@ -35,14 +47,7 @@
                         break;
 
                     case 9: // DOCUMENT_NODE
-                        var hostName = window.location.hostname,
-                            iFrameHostName = $('<a>')
-                                .prop('href', element.prop('src'))
-                                .prop('hostname');
-
-                        if (hostName === iFrameHostName) {
-                            lookup($(el).find('body'));
-                        }
+                        lookup($(el).find('body'));
                         break;
                 }
             });
@@ -159,17 +164,16 @@
          * @protected
          */
         _replacePlaceholder: function (placeholder, html) {
+            var startReplacing = false,
+                prevSibling = null,
+                parent, contents, yy, len, element;
+
             if (!placeholder || !html) {
                 return;
             }
 
-            var parent = $(placeholder.openElement).parent(),
-                contents = parent.contents(),
-                startReplacing = false,
-                prevSibling = null,
-                yy,
-                len,
-                element;
+            parent = $(placeholder.openElement).parent();
+            contents = parent.contents();
 
             for (yy = 0, len = contents.length; yy < len; yy++) {
                 element = contents[yy];