Style sheets enable you to separate your site's content from its presentation, making global changes much easier. Unfortunately, not every browser fully supports style sheets. Worse, what they do support is often buggy, making it very difficult to create style sheets that work across all browsers.

This helps you create cross-browser style sheets by alerting you of problems as you work. What's more, a powerful style checker validates against multiple CSS implementations, alerting you not only to invalid entries in your style sheets, but also to bugs in popular browsers that may affect their display.