关于Accessibility的问题！

请问各位，Accessibility检查点是用来做什么的？

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Accessibility Checkpoints are designed to help you easily locate the areas of your Web site that require special attention according to the W3C Web Content Accessibility Guidelines. They do not necessarily indicate whether or not your Web site conforms to the guidelines.
When you include accessibility checkpoints in your test or component, the Test Results window displays the results of each accessibility option that you checked.

The Test Results window displays a separate step for each accessibility option that was checked in each checkpoint. The results details provide information that can help you pinpoint parts of your Web site or application that may not conform to the W3C Web Content Accessibility Guidelines. The information provided for each check is based on the W3C requirements.

我英文差呀，能不能大概说说做什么的？