Web Accessibility by Google

This course, made available by Udacity, Inc., provides users with "hands-on experience making web applications accessible." The self-paced course begins by explaining "when and why users need accessibility," and covers additional topics such as how to make it possible for site visitors to navigate a page using a keyboard rather than a mouse, how to add semantic HTML and ARIA markup to enable accessibility with a variety of assistive devices, and more. An estimated two weeks in length, the course includes videos, exercises, and interactive quizzes.