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I didn't use it because I thought it would make it more verbose and I couldn't see any distinct advantage in doing so.

Why do you want data-* attributes? If only for validation, why?

you can use data-* attributes in angular,ng-repeat and data-ng-repeat are the same.Trust me they've got your coverred on this.

React does.

No, React does internally, for the purpose of its diffing algorithm (which is subject to changes). React's public facing API does not use data-* whatsoever.

As a matter of fact, storing user data in data-* attributes is unnecessary in React. Just like graphics programming, you're better off storing vertices data in the data structures themselves, not in the final onscreen output of the vertices.

Indeed. I don't believe the GP implied that the data-* had to be user data to count. In fact, the way data-bind is used in Knockout isn't really user data either. You'd store that on the view model, not in a data-* attribute.

batmanjs does. Admittedly its a fairly niche framework but we use it a lot.

angular does