Markup block - Gen<None> - 18 - (0:0,0)
    Tag block - Gen<TagHelper> - 18 - (0:0,0) - p - pTagHelper
        StartTagAndEndTag - <p class="btn" 
        class - DoubleQuotes
            Markup span - Gen<Markup> - [btn] - SpanEditHandler;Accepts:Any - (10:0,10) - Tokens:1
                HtmlTokenType.Text;[btn];
        Tag block - Gen<None> - 3 - (15:0,15)
            Markup span - Gen<Markup> - [<p>] - SpanEditHandler;Accepts:Any - (15:0,15) - Tokens:3
                HtmlTokenType.OpenAngle;[<];
                HtmlTokenType.Text;[p];
                HtmlTokenType.CloseAngle;[>];
