Patch-Magento_PageCache-2.1-page-cache-selector-fix.patch

--- a/view/frontend/web/js/page-cache.js
+++ b/view/frontend/web/js/page-cache.js
@@ -37,7 +37,7 @@ define([
                     case 9: // DOCUMENT_NODE
                         var hostName = window.location.hostname,
                             iFrameHostName = $('<a>')
-                                .prop('href', element.prop('src'))
+                                .prop('href', $(element).prop('src'))
                                 .prop('hostname');
 
                         if (hostName === iFrameHostName) {