public HtmlTag Cell(string text) => HtmlTagExtensions.Text(new HtmlTag("td", this), text);
public HtmlTag Header(string text) => HtmlTagExtensions.Text(new HtmlTag("th", this), text);
private static HtmlTag MakeOption(string display, object value) => HtmlTagExtensions.Attr(HtmlTagExtensions.Text(new HtmlTag("option"), display), "value", value);