Note 1 The Accessibility Guidelines Working Group and the W3C do not specify which or how much support by assistive
      technologies there must be for a particular use of a Web technology in order for it
      to be classified as accessibility supported. (See Level of Assistive Technology Support Needed for "Accessibility Support" .) Note 2 Web technologies can be used in ways that are not accessibility supported as long
      as they are not relied upon and the page as a whole meets the conformance requirements, including Conformance Requirement 4 and Conformance Requirement 5 . Note 3 When a Web Technology is used in a way that is "accessibility supported," it does not imply that the entire
      technology or all uses of the technology are supported. Most technologies, including
      HTML, lack support for at least one feature or use. Pages conform to WCAG only if
      the uses of the technology that are accessibility supported can be relied upon to
      meet WCAG requirements.