-do_action('admin_enqueue_scripts', 'media-upload-popup');
-do_action('admin_print_styles-media-upload-popup');
-do_action('admin_print_styles');
-do_action('admin_print_scripts-media-upload-popup');
-do_action('admin_print_scripts');
-do_action('admin_head-media-upload-popup');
-do_action('admin_head');
-
-if ( is_string($content_func) )
+ /** This action is documented in wp-admin/admin-header.php */
+ do_action( 'admin_enqueue_scripts', 'media-upload-popup' );
+
+ /**
+ * Fires when admin styles enqueued for the legacy (pre-3.5.0) media upload popup are printed.
+ *
+ * @since 2.9.0
+ */
+ do_action( 'admin_print_styles-media-upload-popup' );
+
+ /** This action is documented in wp-admin/admin-header.php */
+ do_action( 'admin_print_styles' );
+
+ /**
+ * Fires when admin scripts enqueued for the legacy (pre-3.5.0) media upload popup are printed.
+ *
+ * @since 2.9.0
+ */
+ do_action( 'admin_print_scripts-media-upload-popup' );
+
+ /** This action is documented in wp-admin/admin-header.php */
+ do_action( 'admin_print_scripts' );
+
+ /**
+ * Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0)
+ * media upload popup are printed.
+ *
+ * @since 2.9.0
+ */
+ do_action( 'admin_head-media-upload-popup' );
+
+ /** This action is documented in wp-admin/admin-header.php */
+ do_action( 'admin_head' );
+
+if ( is_string( $content_func ) ) {
+ /**
+ * Fires in the admin header for each specific form tab in the legacy
+ * (pre-3.5.0) media upload popup.
+ *
+ * The dynamic portion of the hook, `$content_func`, refers to the form
+ * callback for the media upload type. Possible values include
+ * 'media_upload_type_form', 'media_upload_type_url_form', and
+ * 'media_upload_library_form'.
+ *
+ * @since 2.5.0
+ */