WordPress Version: 6.3
/**
* Displays the HTML type based on the blog setting.
*
* The two possible values are either 'xhtml' or 'html'.
*
* @since 2.2.0
*/
function html_type_rss()
{
$type = get_bloginfo('html_type');
if (str_contains($type, 'xhtml')) {
$type = 'xhtml';
} else {
$type = 'html';
}
echo $type;
}