WAVE: Web Accessibility Evaluation Tool

At http://wave.webaim.org/ you will find the easy-to-use WAVE (Web Accessibility Evaluation Tool). There are several ways to use it: put in your URL, upload your HTML files, or cut and paste your code directly into a provided window.

What WAVE returns is your page with an overlay that tags both good accessibility practices and accessibility errors. Errors are noted with a big headline above the page. A screenshot is below, with various tags circled. Click it to see a larger version.

In addition, there is a button in the upper right corner that alows you to disable your CSS styles and see the basic structure of your site, sans CSS. Remember, An accessible document should be well-structured, meaningful, and readable without CSS.