- * @param array $default_html Associative array with two keys: 'quote' where %1$s is replaced with the site description
- * or the selected content, and 'link' there %1$s is link href, %2$s is link text.
+ * @param array $default_html Associative array with three possible keys:
+ * - 'quote' where %1$s is replaced with the site description or the selected content.
+ * - 'link' where %1$s is link href, %2$s is link text, usually the source page title.
+ * - 'embed' which contains an [embed] shortcode when the source page offers embeddable content.
+ * @param array $data Associative array containing the data from the source page.