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@ngdoc overview
@name Developer Guide: Templates: Working With CSS in Angular
@description
Angular sets these CSS classes. It is up to your application to provide useful styling.
# CSS classes used by angular
* `ng-invalid`, `ng-valid`
- **Usage:** angular applies this class to an input widget element if that element's input does
not pass validation. (see {@link api/ng.directive:input input} directive).
* `ng-pristine`, `ng-dirty`
- **Usage:** angular {@link api/ng.directive:input 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`.
## Related Topics
* {@link dev_guide.templates Angular Templates}
* {@link forms Angular Forms}
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