The Americans with Disabilities Act was instituted in 1990 in an effort to end discrimination based on differing abilities. Drawing heavily from the landmark Civil Rights Act of 1964, which established protections against discrimination based on race, religion, sex or national origin, the ADA went a step further by requiring organizations to provide “reasonable accommodations” to employees with disabilities.
For close to seven years, since July of 2010, the United States Department of Justice (DOJ) has talked about issuing regulations specifically about web accessibility. At that time the US Department of Justice (DOJ) began developing accessibility guidelines for public websites under Title III of the Americans with Disabilities Act (ADA). On December 26, 2017, the Department announced that those regulations were officially withdrawn.

The words in the tag should be more than a description. They should provide a text equivalent of the image. In other words, the tag should include the same meaningful information that other users obtain by looking at the image. In the example of the mayor’s picture, adding an “alt” tag with the words “Photograph of Mayor Jane Smith” provides a meaningful description.
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