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# YUI Library Examples: CSS Base: Contextual Example

## CSS Base: Contextual Example

When CSS Base is included in a page it applies rules to all HTML elements via type selectors like this: `h1 {margin-bottom:1em;}`. An alternate version, `-context.css`, uses only descendent selectors like this: `.cssbase-context h1 {margin-bottom:1em;}`. 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.

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##### Note:

Because CSS examples are susceptible to other CSS on the page, this example is only available in a new window at the above link.

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