Is your website accessible to people with disabilities? That's up to 1 in 5 website visitors. A disability could relate to vision, hearing, neurological conditions, and others.
The WCAG 2.0 standards from the World Wide Web Consortium (W3C) build on four ideas, represented by the acronym, POUR:
Your website interface allows visitors to perceive the information presented.
Your website allows visitors to perform the operations, e.g., navigate the website or complete a form.
Visitors can understand your website content and the operations.
Your website content and feature set is robust enough to be used by by a wide variety of user agents, including assistive technologies.