The accessibility of digital content can be evaluated by performing both software-assisted and manual checks to identify issues. Perform a check any time during your content's creation and whenever you add additional content or features. In addition, you can test your content with screen reader software.
You should frequently assess the accessibility of your digital content, such as a single document or web page, a web site, or an entire domain. A thorough process includes both the use of automated tools and manual assessments conducted by knowledgeable humans.
The Web Accessibility Initiative provides a guide to evaluating web accessibility that includes information about manual assessment methods.