Ticket #20755: 20755.2.patch

wp-includes/class-wp-customize-manager.php

@@ -263 +263 @@
 
                 wp_enqueue_script( 'customize-preview' );
                 add_action( 'wp_head', array( $this, 'customize_preview_base' ) );
+                add_action( 'wp_head', array( $this, 'customize_preview_html5' ) );
                 add_action( 'wp_footer', array( $this, 'customize_preview_settings' ), 20 );
                 add_action( 'shutdown', array( $this, 'customize_preview_signature' ), 1000 );
                 add_filter( 'wp_die_handler', array( $this, 'remove_preview_signature' ) );
@@ -284 +285 @@
         }
 
         /**
+         * Print a workaround to handle HTML5 tags in IE < 9
+         *
+         * @since 3.4.0
+         */
+        public function customize_preview_html5() { ?>
+                <!--[if lt IE 9]>
+                <script type="text/javascript">
+                        var e = [ 'abbr', 'article', 'aside', 'audio', 'canvas', 'datalist', 'details',
+                                'figure', 'footer', 'header', 'hgroup', 'mark', 'menu', 'meter', 'nav',
+                                'output', 'progress', 'section', 'time', 'video' ];
+                        for ( var i = 0; i < e.length; i++ ) {
+                                document.createElement( e[i] );
+                        }
+                </script>
+                <![endif]--><?php
+        }
+
+        /**
          * Print javascript settings for preview frame.
          *
          * @since 3.4.0