From the post:
Here at ProfHacker, we’ve written several posts over the years about accessibility, about WordPress, and about WordPress and accessibility. For a variety of reasons, it’s important to make digital resources usable by the widest range of people you can, and ensuring accessibility is an key part of that process. (As many of you already know, there are significant differences between sites run on WordPress.com and those run with WordPress.org software. Among those differences are the availability of certain them and certain plugins. You can read more about the differences on this support page.) Developers involved with WordPress, one of the most widely-used content management systems (CMS) on the Internet, have made great strides in improving and enhancing the accessibility of this particular CMS…
Find out more about WP and accessibility: Access Monitor: WordPress Plugin to Monitor Accessibility