Markup block - Gen<None> - 28 - (0:0,0)
    Tag block - Gen<TagHelper> - 28 - (0:0,0) - div - divTagHelper
        SelfClosing - <div style="" class="btn" />
        style - DoubleQuotes
            Markup block - Gen<None> - 0 - (0:0,0)
        class - DoubleQuotes
            Markup span - Gen<Markup> - [btn] - SpanEditHandler;Accepts:Any - (21:0,21) - Tokens:1
                HtmlTokenType.Text;[btn];
