All website owners should offer their users information and user interfaces in an easily perceivable manner. Moreover, they must provide text alternatives for non-text content such as images, voice, and videos. They must also offer captions or text summaries for audio and video content. Being perceivable also requires that the content should be easy to identify programmatically. This includes ease of listening and reading that features good contrast and easy volume controls. 
With roots in the Civil Rights Act of 1964, the Americans with Disabilities (ADA) was enacted in 1990. According to the National Network, it was designed to “prohibit discrimination against individuals with disabilities in all areas of public life, including jobs, schools, transportation, and all public and private places that are open to the general public”. ADA law has changed significantly in the past 55 years, with the potential for more changes in the future.
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