Markup block - Gen<None> - 31 - (0:0,0)
    Tag block - Gen<None> - 5 - (0:0,0)
        Markup span - Gen<Markup> - [<foo>] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:3
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.Text;[foo];
            SyntaxKind.CloseAngle;[>];
    SyntaxKind.HtmlTextLiteral - [<?xml Hello World ?>] - [5..25) - FullWidth: 20 - Slots: 1
        SyntaxKind.List - [<?xml Hello World ?>] - [5..25) - FullWidth: 20 - Slots: 10
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.QuestionMark;[?];
            SyntaxKind.Text;[xml];
            SyntaxKind.Whitespace;[ ];
            SyntaxKind.Text;[Hello];
            SyntaxKind.Whitespace;[ ];
            SyntaxKind.Text;[World];
            SyntaxKind.Whitespace;[ ];
            SyntaxKind.QuestionMark;[?];
            SyntaxKind.CloseAngle;[>];
    Tag block - Gen<None> - 6 - (25:0,25)
        Markup span - Gen<Markup> - [</foo>] - SpanEditHandler;Accepts:Any - (25:0,25) - Tokens:4
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.ForwardSlash;[/];
            SyntaxKind.Text;[foo];
            SyntaxKind.CloseAngle;[>];
