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Accessibility of PDF electronic books, case of DGD7

Accessibility and Drupal expert Everett Zufelt was kind enough to look at the PDF e-book version of the Definitive Guide to Drupal 7.

1. The PDF is tagged, this is good. In order for a screen-reader user to interact with a PDF the file needs to be parsed into an accessibility API / virtual buffer. Tagging makes it easier and faster for the file to be parsed.

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