HTML tags – specific instructions understood by a web browser or screen reader. One type of HTML tag, called an “alt” tag (short for “alternative text”), is used to provide brief text descriptions of images that screen readers can understand and speak. Another type of HTML tag, called a “longdesc” tag (short for “long description”), is used to provide long text descriptions that can be spoken by screen readers.

This is the reason why I think web design firms have to position themselves as solution providers and not just web guys/gals. A client doesn't need a website, they need sales. The website is just part of that solution but it's not the solution and unlike web design, service like email marketing automation, SEO, and PPC requires an experienced professional.
Now more than ever, search engines are evolving to crawl pages with more human intention. A key element of WCAG is accessibility to screen readers, and these readers crawl your website pages similarly to search engines. If your website meets the Web Content Accessibility Guidelines, it will likely appeal to users, search engines, and screen readers alike, ultimately improving your SEO endeavors. For this reason, meta tagging, alternative image text, and video transcripts should be seriously considered.
The large number of people who have disabilities, coupled with the challenges that they face, is one of the reasons that the Americans with Disabilities Act (ADA) was passed in 1990.² As its name suggests, the ADA is designed to protect individuals with disabilities in the United States. The ADA essentially makes it illegal for any government entity or business to provide goods and services to the general public without ensuring that the entities are accessible by people with disabilities. In today’s digitally driven world, many businesses fail to follow web accessibility best practices. In fact, this is why the Supplemental Advanced Notice of Proposed Rulemaking (SANPRM) was created by the U.S. Department of Justice (DOJ). To ensure that they are implementing digital accessibility best practices, organizations are encouraged to use the WCAG 2.1 technical requirements.³
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Title III of the Americans with Disabilities Act (ADA) prohibits discrimination on the basis of disability in places of public accommodation, including restaurants, movie theaters, schools, day care and recreational facilities, and doctors’ offices. All public places, as well as privately owned commercial facilities, are required to comply with ADA standards.
Courts have essentially taken three positions when approached with this issue. Some courts take the position that the ADA applies to all commercial sites because the law was meant to protect disabled individuals from having a more difficult time than able-bodied individuals from doing business. That is why the website Scribd was unable to get a case summarily dismissed and ended up settling.