Markup block - Gen<None> - 34 - (0:0,0)
    Tag block - Gen<TagHelper> - 34 - (0:0,0) - person - PersonTagHelper
        SelfClosing - <person birthday="DateTime.Now" />
        birthday - DoubleQuotes
            Code span - Gen<Expr> - [DateTime.Now] - ImplicitExpressionEditHandler;Accepts:AnyExceptNewline;ImplicitExpression[ATD];K14 - (18:0,18) - Tokens:1
                HtmlTokenType.Text;[DateTime.Now];
