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Book Overview & Buying
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Table Of Contents
Adobe Acrobat Ninja
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Accessibility in PDFs begins with tags. Since PDF document pages were initially just PostScript files meant for viewing on a screen as read-only content, it was necessary to come up with a method to describe each portion of a page’s relevant information in both text and images and to build a logical structure for an entire publication, so that text-based screen readers could use it when converting code to synthesized speech.
Tags in PDFs look similar, and some may have the same meaning as HTML tags, but they should not be confused as being the same. Unlike HTML tags that mark up and organize countless lines of text that are eventually interpreted, formatted, and displayed on a screen by a browser, PDF accessibility tags do not control the appearance of a document. They simply describe the type of content on a page.
While the tagging order in HTML is also used to order the tagged content in the browser this is not the case in PDF. In...
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