Markup block - Gen<None> - 17 - (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 - [${bar}] - [5..11) - FullWidth: 6 - Slots: 1
        SyntaxKind.Text;[${bar}];
    Tag block - Gen<None> - 6 - (11:0,11)
        Markup span - Gen<Markup> - [</foo>] - SpanEditHandler;Accepts:Any - (11:0,11) - Tokens:4
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.ForwardSlash;[/];
            SyntaxKind.Text;[foo];
            SyntaxKind.CloseAngle;[>];
