A shortcode to output your child theme URL to be used in Posts, Pages and/or Widgets.

child-theme-url.php

<?php
//* Do NOT include the opening php tag

//* Get path to our child theme folder
//* Useage: [theme-url]
function b3m_theme_uri_shortcode( $attrs = array (), $content = '' ) {
		
    $theme_uri = is_child_theme() ? get_stylesheet_directory_uri() : get_template_directory_uri();
    
    return $theme_uri;

}
add_shortcode( 'theme-url', 'b3m_theme_uri_shortcode' );