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<p>Angular sets these CSS classes. It is up to your application to provide useful styling.</p>
<h1 id="css-classes-used-by-angular">CSS classes used by angular</h1>
<ul>
<li><p><code>ng-scope</code></p>
<ul>
<li><strong>Usage:</strong> angular applies this class to any element that where a new <a href="api/ng/type/$rootScope.Scope">scope</a>
is defined. (see <a href="guide/scope">scope</a> guide for more information about scopes)</li>
</ul>
</li>
<li><p><code>ng-binding</code></p>
<ul>
<li><strong>Usage:</strong> 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><p><code>ng-invalid</code>, <code>ng-valid</code></p>
<ul>
<li><strong>Usage:</strong> angular applies this class to an input 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><p><code>ng-pristine</code>, <code>ng-dirty</code></p>
<ul>
<li><strong>Usage:</strong> angular <a href="api/ng/directive/input">input</a> directive applies <code>ng-pristine</code> 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 <code>ng-dirty</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>