include_outside_js_css_for_preview_header
Usage:
add_action('include_outside_js_css_for_preview_header', 'your_function');
function your_function(){
//Do Your Action
//enqueue external js/css in header.
}
add_action('include_outside_js_css_for_preview_header', 'your_function');
function your_function(){
//Do Your Action
//enqueue external js/css in header.
}