Ticket #30770: enqueue_js_fix_script.patch

functions.php

@@ -194 +194 @@
 endif;
 
 /**
+ * Enqueue script to fix JS flash
+ * 
+ * @since Twenty Fifteen 1.1
+ */
+function twentyfifteen_enqueue_js_fix() {
+        ?>
+        <script>(function(){document.documentElement.className='js'})();</script>
+        <?php
+}
+add_action( 'wp_head', 'twentyfifteen_enqueue_js_fix', 0 );
+
+/**
  * Enqueue scripts and styles.
  *
  * @since Twenty Fifteen 1.0

header.php

@@ -18 +18 @@
         <!--[if lt IE 9]>
         <script src="<?php echo esc_url( get_template_directory_uri() ); ?>/js/html5.js"></script>
         <![endif]-->
-        <script>(function(){document.documentElement.className='js'})();</script>
         <?php wp_head(); ?>
 </head>