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.
Levels of conformanceA
Yahoo Japan Corporation
Social Welfare Corporation Wakatake‐Daijukai
National Institutes for Cultural Heritage
Levels of conformanceAA
NTT DOCOMO, INC.
KONICA MINOLTA, INC.
FUJI ELECTRIC CO., LTD.