Angularjs, using data-ng-controller and ng-controller [duplicate]

Question

Sometimes I see data-ng-controller but more often ng-controller

The ng-controller I already have used and this seems clear. But data-ng-controller.. what is for?

What are the differences between them, and where to use what?

Answer 1

There is no difference except for validation and browser compatibility.

Angular js will not work in IE8 unless data is present

[Update]

• The above is for versions 1.0.* and 1.2.*
• 1.3.* does not support ie8 so you don't need data-

Answer 2

Angularjs uses a normalization process for directive name / attributes matching.

From the angularjs docu at http://docs.angularjs.org/guide/directive.

Section Matching Directives:

The normalization process is as follows:

Strip x- and data- from the front of the element/attributes. Convert the :, -, or _-delimited name to camelCase.