Markup block - Gen<None> - 22 - (0:0,0)
    Tag block - Gen<None> - 22 - (0:0,0)
        Markup span - Gen<Markup> - [<a] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:2
            SyntaxKind.OpenAngle;[<];
            SyntaxKind.Text;[a];
        Markup block - Gen<Attr:*something, *something='@(2:0,2),'@(18:0,18)> - 17 - (2:0,2)
            Markup span - Gen<None> - [ *something='] - SpanEditHandler;Accepts:Any - (2:0,2) - Tokens:4
                SyntaxKind.Whitespace;[ ];
                SyntaxKind.Text;[*something];
                SyntaxKind.Equals;[=];
                SyntaxKind.SingleQuote;['];
            Markup span - Gen<LitAttr:@(15:0,15)> - [Foo] - SpanEditHandler;Accepts:Any - (15:0,15) - Tokens:1
                SyntaxKind.Text;[Foo];
            Markup span - Gen<None> - ['] - SpanEditHandler;Accepts:Any - (18:0,18) - Tokens:1
                SyntaxKind.SingleQuote;['];
        Markup span - Gen<Markup> - [ />] - SpanEditHandler;Accepts:None - (19:0,19) - Tokens:3
            SyntaxKind.Whitespace;[ ];
            SyntaxKind.ForwardSlash;[/];
            SyntaxKind.CloseAngle;[>];
