Dokumentationen på Codex er ikke lysende klar; men et plugin gør sådan:

/* filters etc. */
add_action('wp_print_styles', 'add_hyperboard_stylesheet');

// (...)

/*Required stylesheets */
function add_hyperboard_stylesheet() {
	$myStyleUrl = WP_PLUGIN_URL . '/hyperboard/styles.css';
	$myStyleFile = WP_PLUGIN_DIR . '/hyperboard/styles.css';

        if ( file_exists($myStyleFile) ) {
            wp_register_style('HyperBoardStyleSheets', $myStyleUrl);
            wp_enqueue_style( 'HyperBoardStyleSheets');

Pluginet sætter en krog i wp_print_styles.

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