The attribute for alt text has been around since the beginning of HTML back in 1993, but it wasn't considered a tag to add to images on web pages until 1999.
It wasn't considered a necessary component until 2006 when the National Federation of the Blind (NFB) filed a class action lawsuit to challenge whether the limitations of the Americans with Disabilities Act (ADA) of 1990 applied to websites.
To best understand how alternative text should be used or written, refer to this helpful decision tree.
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