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Angular sets these CSS classes. It is up to your application to provide useful styling.
<h1 id="css-classes-used-by-angular">CSS classes used by angular</h1>
<ul>
<li><code>ng-scope</code>
<ul>
<li>Usage: angular applies this class to any element for which a new <a href="api/ng/service/$rootScope">scope</a>
is defined. (see <a href="guide/scope">scope</a> guide for more information about scopes)</li>
</ul>
</li>
<li><code>ng-isolate-scope</code>
<ul>
<li>Usage: angular applies this class to any element for which a new
<a href="guide/directive#isolating-the-scope-of-a-directive">isolate scope</a> is defined.</li>
</ul>
</li>
<li><code>ng-binding</code>
<ul>
<li>Usage: angular applies this class to any element that is attached to a data binding, via <code>ng-bind</code> or
<code>{{}}</code> curly braces, for example. (see <a href="guide/databinding">databinding</a> guide)</li>
</ul>
</li>
<li><code>ng-invalid</code>, <code>ng-valid</code>
<ul>
<li>Usage: angular applies this class to a form control widget element if that element&#39;s input does
not pass validation. (see <a href="api/ng/directive/input">input</a> directive)</li>
</ul>
</li>
<li><code>ng-pristine</code>, <code>ng-dirty</code>
<ul>
<li>Usage: angular <a href="api/ng/directive/ngModel">ngModel</a> directive applies <code>ng-pristine</code> class
to a new form control widget which did not have user interaction. Once the user interacts with
the form control, the class is changed to <code>ng-dirty</code>.</li>
</ul>
</li>
<li><code>ng-touched</code>, <code>ng-untouched</code>
<ul>
<li>Usage: angular <a href="api/ng/directive/ngModel">ngModel</a> directive applies <code>ng-untouched</code> class
to a new form control widget which has not been blurred. Once the user blurs the form control,
the class is changed to <code>ng-touched</code>.</li>
</ul>
</li>
</ul>
<h2 id="related-topics">Related Topics</h2>
<ul>
<li><a href="guide/templates">Angular Templates</a></li>
<li><a href="guide/forms">Angular Forms</a></li>
</ul>