<div class="intro">
    <p>CSS Base can be used contextually by appyling CSS Base to specific regions of the page.</p>
</div>

<div class="example newwindow">
    <a href="cssbase-context-example.html" target="_blank" class="button">
        View Example in New Window
    </a>
</div>

    <h2>Contextual Usage</h2>
    <p>When CSS Base is included in a page it applies rules to all HTML elements via type selectors like this: <code>h1 {margin-bottom:1em;}</code>. An alternate version, <code>cssbase-context.css</code>, uses only descendent selectors like this: <code>.yui3-cssbase-context h1 {margin-bottom:1em;}</code>. This means you can put that class value on a node in your document to choose which region(s) of your page CSS Base will be applied to.</p>

```
<div class="yui3-cssbase">
    <p>Everything within this container will have CSS Base applied.</p>
</div>
```

<h3>Note:</h3>
<p>Because CSS examples are susceptible to other CSS on the page, this example is only available in a new window at the above link.</p>
