/// <summary>White lists the specified space seperated CSS class names.</summary>
/// <param name="sanitizer">The sanitizer.</param>
/// <param name="classNames">The class names.</param>
/// <returns></returns>
public static HtmlSanitizer AllowCss(this HtmlSanitizer sanitizer, string classNames)
{
return(sanitizer.AllowCss(classNames.Split(' ')));
}