Markup block - Gen<None> - 31 - (0:0,0)
    Tag block - Gen<TagHelper> - 31 - (0:0,0) - p - pTagHelper - catchAllTagHelper
        SelfClosing - <p class="btn" catchAll="hi" />
        class - DoubleQuotes
            Markup span - Gen<Markup> - [btn] - SpanEditHandler;Accepts:Any - (10:0,10) - Tokens:1
                HtmlTokenType.Text;[btn];
        catchAll - DoubleQuotes
            Markup span - Gen<Markup> - [hi] - SpanEditHandler;Accepts:Any - (25:0,25) - Tokens:1
                HtmlTokenType.Text;[hi];
