Minimum standard. Without achieving "A" standard, it is assumed that there could be a group of people who might not be able to browse the website comfortably.
The desirable standard. If "AA" standard is achieved, there will be less cases of difficulty in browsing websites.
Advanced criteria. A website would be the most accessible to browse if "AAA" standard is achieved.
NTT NIPPON TELEGRAPH AND TELEPHONE CORPORATION.
Levels of conformanceAA
Cambridge Technology Partners
Hiroshima International Airport
ANA All Nippon Airways