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+@ngdoc overview
+@name  Working With CSS
+@description
+
+
+Angular sets these CSS classes. It is up to your application to provide useful styling.
+
+# CSS classes used by angular
+
+* `ng-scope`
+  - **Usage:** angular applies this class to any element that where a new {@link ng.$rootScope.Scope scope}
+    is defined. (see {@link guide/scope scope} guide for more information about scopes)
+
+* `ng-binding`
+  - **Usage:** angular applies this class to any element that is attached to a data binding, via `ng-bind` or
+    `{{}}` curly braces, for example. (see {@link guide/databinding databinding} guide)
+
+* `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 ng.directive:input input} directive)
+
+* `ng-pristine`, `ng-dirty`
+  - **Usage:** angular {@link 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 guide/templates Angular Templates}
+* {@link guide/forms Angular Forms}