4 February 2019
To comply with legal expectations such as the Americans with Disabilities Act of 1990, the Rehabilitation Act of 1973, and other laws and court rulings, we must make our electronic documents, websites, software applications (mobile, desktop, web, etc.), video, audio, and hardware accessible to persons with a wide range of abilities and disabilities.
As examples, consider users who have
visual impairments (blindness, low vision, color blindness, etc.)
hearing impairments (deafness, hard of hearing, etc.)
fine motor impairments (inability to use some input devices such as mice, etc.; use assistive technologies such as speech input head pointers, etc.)
learning challenges (dyslexia, auditory processing disorder, etc.)
limited English fluency
mobile devices rather than full-size monitors
limited experience using computing devices
It is usually better to treat accessibility as a design concern from the beginning rather than an add-on feature at the end of development.
University of Washington, Getting Started with Accessibility
Subpages on creating accessible documents, websites, and videos
World-Wide Web Consortium (W3C), Web Content Accessibility Guidelines (WCAG)