registerEscapeMode("css", new StyleEscapeFunction(false));
registerEscapeMode("css_unquoted", new StyleEscapeFunction(true));
// HTML functions.
registerFunction("html_strip", new HtmlStripFunction());
registerFunction("text_html", new TextHtmlFunction());
// url_validate is available as an argument to <?cs escape: ?>
// though it isn't in ClearSilver.
registerFunction("url_validate", new HtmlUrlValidateFunction(false), true);