Angular sets these CSS classes. It is up to your application to provide useful styling.
ng-scope
ng-binding
ng-bind or
{{}} curly braces, for example. (see databinding guide)ng-invalid, ng-valid
input directive)ng-pristine, ng-dirty
input directive applies ng-pristine class
to a new input widget element which did not have user interaction. Once the user interacts with
the input widget the class is changed to ng-dirty.