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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. WCAG 2.1 is backwards-compatible with WCAG 2.0, which it extends with a further 17 success criteria.
A global city, also known as a power city, world city, alpha city, or world center, is a city that serves as a primary node in the global economic network. The concept originates from geography and urban studies, based on the thesis that globalization has created a hierarchy of strategic geographic locations with varying degrees of influence over finance, trade, and culture worldwide.
Accessibility is the design of products, devices, services, vehicles, or environments so as to be usable by people with disabilities. [1] The concept of accessible design and practice of accessible development ensures both "direct access" (i.e. unassisted) and "indirect access" meaning compatibility with a person's assistive technology [2] (for ...
168,200 aortic aneurysms (2015) [5] Abdominal aortic aneurysm ( AAA) is a localized enlargement of the abdominal aorta such that the diameter is greater than 3 cm or more than 50% larger than normal. [1] An AAA usually causes no symptoms, except during rupture. [1] Occasionally, abdominal, back, or leg pain may occur. [2]
World Book Encyclopedia. The World Book Encyclopedia is an American encyclopedia. [1] World Book was first published in 1917. Since 1925, a new edition of the encyclopedia has been published annually. [1] Although published online in digital form for a number of years, World Book is currently the only American encyclopedia which also still ...
Common knowledge is knowledge that is publicly known by everyone or nearly everyone, usually with reference to the community in which the knowledge is referenced. [1] Common knowledge can be about a broad range of subjects, such as science, literature, history, or entertainment. [1] Since individuals often have different knowledge bases, common ...
American Automobile Association ( AAA – commonly pronounced as " Triple A " but also pronounced as individual letters) is a federation of motor clubs throughout North America. AAA is a privately held not-for-profit national member association and service organization with over 60 million members [1] in the United States and Canada. [2]
Republic ( Greek: Πολιτεία, translit. Politeia; Latin: De Republica [1]) is a Socratic dialogue, authored by Plato around 375 BC, concerning justice ( δικαιοσύνη ), the order and character of the just city-state, and the just man. [2]