Markup block - Gen<None> - 29 - (0:0,0)
    Tag block - Gen<TagHelper> - 29 - (0:0,0) - p - PTagHelper
        StartTagAndEndTag - <p bound-int class='btn'> ... </p>
        bound-int - Minimized
        class - SingleQuotes
            Markup span - Gen<Markup> - [btn] - SpanEditHandler;Accepts:Any - (20:0,20) - Tokens:1
                HtmlTokenType.Text;[btn];
