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Chapter 10. Document Interchange > Accessibility Support

10.8. Accessibility Support

PDF includes several facilities in support of accessibility of documents to users with disabilities. In particular, many visually computer users with visual impairments use screen readers to read documents aloud. To enable proper vocalization, either through a screen reader or by some more direct invocation of a text-to-speech engine, PDF supports the following features:

  • Specifying the natural language used for text in a PDF document—for example, as English or Spanish (see Section 10.8.1, “Natural Language Specification”)

  • Providing textual descriptions for images or other items that do not translate naturally into text (Section 10.8.2, “Alternate Descriptions”), or replacement text for content that does translate into text but is represented in a nonstandard way (such as with a ligature or illuminated character; see Section 10.8.3, “Replacement Text”)

  • Specifying the expansion of abbreviations or acronyms (Section 10.8.4, “Expansion of Abbreviations and Acronyms”)


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