Ticket #42341: 42341.diff

src/js/_enqueues/wp/customize/controls.js

@@ -6285 +6285 @@
                                 name: 'customize-' + previewFrame.channel()
                         } );
                         previewFrame.iframe.attr( 'onmousewheel', '' ); // Workaround for Safari bug. See WP Trac #38149.
+                        previewFrame.iframe.attr( 'sandbox', 'allow-forms allow-modals allow-orientation-lock allow-pointer-lock allow-popups allow-popups-to-escape-sandbox allow-presentations allow-same-origin allow-scripts allow-top-navigation-by-user-activation' );
 
                         if ( ! hasPendingChangesetUpdate ) {
                                 previewFrame.iframe.attr( 'src', urlParser.href );

src/js/_enqueues/wp/customize/preview.js

@@ -377 +377 @@
                         queryParams.customize_messenger_channel = api.settings.channel;
                 }
                 element.search = $.param( queryParams );
-
-                // Prevent links from breaking out of preview iframe.
-                if ( api.settings.channel ) {
-                        element.target = '_self';
-                }
         };
 
         /**