I saw the rel attribute in someone else's code, which stores the value for working with JS. On caniuse rel is poorly supported by browsers. Is this a normal code?

Question

HTML

Is it ok to use rel in this way? Is it poorly supported by browsers only in the form for which it was intended? But just like ... an attribute for storing any values ​​- no?
Is this bad code? After all, there are data-* attributes. Or am I not understanding something?

Answer 1

In Javascript, you can work with any attributes, be it data or rel or anything else. It's just customary to work with data.