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MVC Razor syntax: @ followed by HTML
@Html.Tmpl(@<p>text to display</p>)

public static HelperResult Tmpl<TModel>( this HtmlHelper<TModel> html, Func<HtmlHelper<TModel>, HelperResult> template )
{
    return new HelperResult( writer => template( html ).WriteTo( writer ) );
}

public static HelperResult List<T>(this IEnumerable<T> items,
  Func<T, HelperResult> template) {
    return new HelperResult(writer => {
        foreach (var item in items) {
            template(item).WriteTo(writer);
        }
    });
}