Markup block - Gen<None> - 26 - (0:0,0)
    Tag block - Gen<None> - 11 - (0:0,0)
        Markup span - Gen<Markup> - [<1-foo+bar>] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:3
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.Text;[1-foo+bar];
            SyntaxKind.CloseAngle;[>];
    Markup span - Gen<Markup> - [foo] - SpanEditHandler;Accepts:Any - (11:0,11) - Tokens:1
        SyntaxKind.Text;[foo];
    Tag block - Gen<None> - 12 - (14:0,14)
        Markup span - Gen<Markup> - [</1-foo+bar>] - SpanEditHandler;Accepts:None - (14:0,14) - Tokens:4
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.ForwardSlash;[/];
            SyntaxKind.Text;[1-foo+bar];
            SyntaxKind.CloseAngle;[>];
