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.
Prime Minister's Office of Japan
Levels of conformanceAA
Takeda Pharmaceuticals: Global Homepage
CHUGAI PHARMACEUTICAL CO.,LTD.
Oshiete Gan no Koto
Finnair | Flights and flight tickets to over 80 destinations around the world
Official Site | Norton™ - Antivirus & Anti-Malware Software
Iowa State University