_wp_admin_html_begin()
Source
File: wp-admin/includes/template.php
function _wp_admin_html_begin() {
global $is_IE;
$admin_html_class = ( is_admin_bar_showing() ) ? 'wp-toolbar' : '';
if ( $is_IE )
@header('X-UA-Compatible: IE=edge');
?>
<!DOCTYPE html>
<!--[if IE 8]>
<html xmlns="http://www.w3.org/1999/xhtml" class="ie8 <?php echo $admin_html_class; ?>" <?php
/**
* Fires inside the HTML tag in the admin header.
*
* @since WP-2.2.0
*/
do_action( 'admin_xml_ns' );
?> <?php language_attributes(); ?>>
<![endif]-->
<!--[if !(IE 8) ]><!-->
<html xmlns="http://www.w3.org/1999/xhtml" class="<?php echo $admin_html_class; ?>" <?php
/** This action is documented in wp-admin/includes/template.php */
do_action( 'admin_xml_ns' );
?> <?php language_attributes(); ?>>
<!--<![endif]-->
<head>
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php echo get_option('blog_charset'); ?>" />
<?php
}