+/**
+ * Add metadata to a CSS stylesheet.
+ *
+ * Works only if the stylesheet has already been added.
+ *
+ * Possible values for $key and $value:
+ * 'conditional' string Comments for IE 6, lte IE 7 etc.
+ * 'rtl' bool|string To declare an RTL stylesheet.
+ * 'suffix' string Optional suffix, used in combination with RTL.
+ * 'alt' bool For rel="alternate stylesheet".
+ * 'title' string For preferred/alternate stylesheets.
+ *
+ * @see WP_Dependency::add_data()
+ *
+ * @since 3.6.0
+ *
+ * @param string $handle Name of the stylesheet.
+ * @param string $key Name of data point for which we're storing a value.
+ * Accepts 'conditional', 'rtl' and 'suffix', 'alt' and 'title'.
+ * @param mixed $value String containing the CSS data to be added.
+ * @return bool True on success, false on failure.
+ */
+function wp_style_add_data( $handle, $key, $value ) {
+ return wp_styles()->add_data( $handle, $key, $value );