Markup block - Gen<None> - 43 - (0:0,0)
    Tag block - Gen<TagHelper> - 43 - (0:0,0) - input - InputTagHelper1 - InputTagHelper3
        SelfClosing - <input class='btn' bound-required-string />
        class - SingleQuotes
            Markup span - Gen<Markup> - [btn] - SpanEditHandler;Accepts:Any - (14:0,14) - Tokens:1
                HtmlTokenType.Text;[btn];
        bound-required-string - Minimized
