Because the ADA does not specifically mention websites, it also does not outline standards for how organizations can make their websites accessible. However, the DOJ has frequently cited recommendations such as the Web Content Accessibility Guidelines (WCAG) 2.0 as acceptable metrics for accessibility. WCAG 2.0 includes many different criteria at three different “success levels” of accessibility, ranging from high-contrast color schemes to closed captions for video content.
Decided by the US Supreme Court in 2002, this case  held that even requests for accommodation that might seem reasonable on their face, e.g., a transfer to a different position, can be rendered unreasonable because it would require a violation of the company's seniority system. While the court held that, in general, a violation of a seniority system renders an otherwise reasonable accommodation unreasonable, a plaintiff can present evidence that, despite the seniority system, the accommodation is reasonable in the specific case at hand, e.g., the plaintiff could offer evidence that the seniority system is so often disregarded that another exception wouldn't make a difference.
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.