Markup block - Gen<None> - 32 - (0:0,0)
    Tag block - Gen<TagHelper> - 32 - (0:0,0) - p - ptaghelper
        StartTagAndEndTag - <p> ... </p>
        Markup span - Gen<Markup> - [Hello World ] - SpanEditHandler;Accepts:Any - (3:0,3) - Tokens:4
            SyntaxKind.Text;[Hello];
            SyntaxKind.Whitespace;[ ];
            SyntaxKind.Text;[World];
            SyntaxKind.Whitespace;[ ];
        Expression block - Gen<Expr> - 13 - (15:0,15)
            Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (15:0,15) - Tokens:1
                SyntaxKind.Transition;[@];
            Code span - Gen<Expr> - [DateTime.Now] - ImplicitExpressionEditHandler;Accepts:NonWhitespace;ImplicitExpression[RTD];K14 - (16:0,16) - Tokens:3
                SyntaxKind.Identifier;[DateTime];
                SyntaxKind.Dot;[.];
                SyntaxKind.Identifier;[Now];
