Markup block - Gen<None> - 28 - (0:0,0)
    Tag block - Gen<None> - 28 - (0:0,0)
        Markup span - Gen<Markup> - [<                      LF   ] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:4
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.Whitespace;[                      ];
            SyntaxKind.NewLine;[LF];
            SyntaxKind.Whitespace;[   ];
