Good question. The difference is simple – there is absolutely no difference between the two except that certain HTML5 validators will throw an error on a property like ng-app
, but they don’t throw an error for anything prefixed with data-
, like data-ng-app
.
So to answer your question, use data-ng-app
if you would like validating your HTML to be a bit easier.
Fun fact: You can also use x-ng-app
to the same effect.