Markup block - Gen<None> - 20 - (0:0,0)
    Tag block - Gen<TagHelper> - 20 - (0:0,0) - p - ptaghelper
        StartTagAndEndTag - <p> ... </p>
        Expression block - Gen<Expr> - 13 - (3:0,3)
            Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (3:0,3) - Tokens:1
                CSharpTokenType.Transition;[@];
            Code span - Gen<Expr> - [DateTime.Now] - ImplicitExpressionEditHandler;Accepts:NonWhiteSpace;ImplicitExpression[RTD];K14 - (4:0,4) - Tokens:3
                CSharpTokenType.Identifier;[DateTime];
                CSharpTokenType.Dot;[.];
                CSharpTokenType.Identifier;[Now];
