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WCAG 2.0 uses the same three levels of conformance (A, AA, AAA) as WCAG 1.0, but has redefined them. The WCAG working group maintains an extensive list of web accessibility techniques and common failure cases for WCAG 2.0. [24] WCAG 2.1 is backwards-compatible with WCAG 2.0, which it extends with a further 17 success criteria.
Web Content Accessibility Guidelines in Japan were established in 2004 as JIS (Japanese Industrial Standards) X 8341–3. JIS X 8341-3 was revised in 2010 as JIS X 8341-3:2010 to encompass WCAG 2.0, and it was revised in 2016 as JIS X 8341-3:2016 to be identical standards with the international standard ISO/IEC 40500:2012.
Web "content" generally refers to the information in a Web page or Web application, including text, images, forms, and sounds. (More specific definitions are available in the WCAG documents.) [74] The WCAG is separated into three levels of compliance, A, AA and AAA.
Previous versions of EN 301 549 embraced WCAG 2.0 as an ‘electronic attachment’. The next version of EN 301 549 (v4.1.1) will be released in 2026. [11] This new version is planned to support the European Accessibility Act and to include WCAG 2.2 AA, as well as significant updates to requirements related to Real-Time Text. [12]
AAA apply to affected area abdominal aortic aneurysm: a.c. ante cibum: before meals a.c.h.s., ac&hs ante cibum et hora somni: before meals and at bedtime a.d. auris dextra: right ear a single-storey a can be mistaken as an o which could read "o.d.", meaning right eye ad., add. adde addatur: add let there be added ad lib. ad libitum
Meaning [1] Latin (or Neo-Latin) origin [1] a.c. before meals: ante cibum a.d., ad, AD right ear auris dextra a.m., am, AM morning: ante meridiem: nocte every night Omne Nocte a.s., as, AS left ear auris sinistra a.u., au, AU both ears together or each ear aures unitas or auris uterque b.d.s, bds, BDS 2 times a day bis die sumendum b.i.d., bid, BID
Ensure the contrast of the text with its background reaches at least Web Content Accessibility Guidelines (WCAG) 2.0's AA level, and AAA level when feasible (see WCAG's "Understanding SC 1.4.3: Contrast (Minimum)").
Guidelines on this page are ordered primarily by priority, then difficulty. The priority levels are determined by the Accessibility Success Criteria rankings A, AA, and AAA (in descending order of importance as accessibility considerations) of the World Wide Web Consortium (W3C) Web Content Accessibility Guidelines (WCAG) 2.0.