Example of CSS browser selectors from Firefox3 on a Mac

CSS Browser Selector automatically includes browser/OS-specific CSS selectors in your HTML.

Known Issues:
If everything is enabled and you're still not seeing the browser/OS classnames in your body HTML tag, this is most likely because you are using the Garland or similar theme where it does not output this variable.

The simple solution: modify your page.tpl.php file so that the tag now outputs this variable, like so:
<html class="<?php print $body_classes; ?>">

The more advanced solution is to write a custom theme function to replace what currently outputs the CSS in your body tag.

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