Large Red 'X' implies ES5 snippets contain errors

[jakutkoski]

The large red Xs in the top-right corners of the ES5 code snippets somewhat imply that they contain errors. Should they be taken away or changed to something else to imply that the ES6 way is better?

[Jurosh]

For me it looks pretty obvious that there is new, usually better notation which you can use - ES6, so old, uglier notation can be marked as (X).

Or maybe you can try to update it to something else, so that we can have a look..

[jxu]

the way MDN does it is with a thumbs down for deprecated which I think is funny. although ES5 isn't deprecated.