In 2010 the U.S. Department of Justice (DOJ) released the 2010 ADA Standards for Accessible Design. This update to the Americans with Disabilities Act of 1990 has consistently been interpreted by U.S. courts to apply to digital content including websites, applications, mobile apps, and PDFs. The Web Content Accessibility Guidelines (WCAG) are technical guidelines referenced when testing for ADA website accessibility. Today, WCAG 2.1 A & AA is considered the minimum standard for ADA website compliance.
Meanwhile, the tech community and our courts system were forced to deal with the issue on their own. First, the tech community coalesced around a set of standards via the World Wide Web Consortium, establishing the Web Content Accessibility Guidelines in 2008 and later updating them in 2012 (WCAG 2.0), when they were also adopted as an ISO standard. Today, web designers and developers across the world use WCAG 2.0 to guide their design and development, typically aiming to meet all of the standards under Level AA.
Spector v. Norwegian Cruise Line Ltd. was a case that was decided by the United States Supreme Court in 2005. The defendant argued that as a vessel flying the flag of a foreign nation it was exempt from the requirements of the ADA. This argument was accepted by a federal court in Florida and, subsequently, the Fifth Circuit Court of Appeals. However, the U.S. Supreme Court reversed the ruling of the lower courts on the basis that Norwegian Cruise Lines was a business headquartered in the United States whose clients were predominantly Americans and, more importantly, operated out of port facilities throughout the United States.