Of note for accessibility is PDF/UA (Universal Accessibility) which became an ISO Standard in July 2012, and was updated in 2014 (ISO 14289-1:2014 (See PDF/UA (ISO 14289-1:2014).) The scope of PDF/UA is not meant to be a techniques (how-to) specification, but rather a set of guidelines for creating more accessible PDF. In July 2008, PDF 1.7 became an ISO standard (ISO 32000-1). The PDF specification was introduced by Adobe Systems in 1993 as a publicly available standard. PDF files specify the appearance of pages in a document in a reliable, device-independent manner. The Portable Document Format (PDF) is a file format for representing documents in a manner independent of the application software, hardware, and operating system used to create them, as well as of the output device on which they are to be displayed or printed. PDF23: Providing interactive form controls in PDF documents.PDF22: Indicating when user input falls outside the required format or.PDF21: Using List tags for lists in PDF documents. ![]()
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