How to add an HTML tag to the Header?
The hook you’re looking for is wp_head. functions.php add_action( ‘wp_head’, ‘se343581_add_preload_tag’, 5); function se343581_add_preload_tag() { echo ‘<link rel=”preload” href=”‘. plugins_url(‘/gdpr-cookie-compliance/dist/styles/lity.css’) . ‘” as=”style”>’; // // — if added in plugin file — // echo ‘<link rel=”preload” href=”‘ . plugin_dir_url( __FILE__ ) . ‘some_subdir/file_name.css” as=”style”>’; }