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+@workInProgress
+@ngdoc overview
+@name Developer Guide: CSS
+@description
+
+# CSS
+angular includes built-in CSS classes, which in turn have predefined CSS styles.
+
+# Built-in CSS classes
+
+## `ng-exception`
+
+**Usage:** angular applies this class to a DOM element if that element contains an Expression that
+threw an exception when evaluated.
+
+**Styling:** The built-in styling of the ng-exception class displays an error message surrounded
+by a solid red border, for example:
+
+ > <div class="ng-exception">Error message</div>
+
+
+
+You can try to evaluate malformed expressions in {@link angualr.expression expression} to see the
+`ng-exception` class' styling.
+
+## `ng-validation-error`
+
+**Usage:** angular applies this class to an input widget element if that element's input does not
+pass validation. Note that you set the validation criteria on the input widget element using the
+Ng:validate or Ng:required directives.
+
+**Styling:** The built-in styling of the ng-validation-error class turns the border of the input
+box red and includes a hovering UI element that includes more details of the validation error. You
+can see an example in {@link angular.widget.@ng:validate ng:validate example}.
+
+## How to override the styles for built-in classes
+
+To override the styles for these built-in classes, you can do any of the following:
+
+Download the source code, edit angular.css, and host the source on your own server.
+Create a local css file, overriding any styles that you'd like, and link to it from your HTML file
+as you normally would:
+
+<pre>
+<link href="yourfile.css" rel="stylesheet" type="text/css">
+</pre>