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Adobe ACROBAT X STANDARD Manual

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USING ACROBAT X STANDARD
Accessibility, tags, and reflow
Last updated 10/11/2011
Security that doesn’t interfere with assistive software
Some PDF authors restrict users from printing, copying, extracting, adding comments, or editing text. The text of an
accessible PDF must be available to a screen reader. You can use Acrobat to ensure that security settings don’t interfere
with the screen reader’s ability to convert onscreen text to speech.
For more information about PDF accessibility, see www.webaim.org/techniques/acrobat/.
More Help topics
“Recognize text in scanned documents” on page 46
“Set the document language” on page 258
“Prevent security settings from interfering with screen readers” on page 258
“Keys for accessibility” on page 346
About tags, accessibility, reading order, and reflow
PDF tags are similar in many ways to XML tags. PDF tags indicate document structure: which text is a heading, which
content makes up a section, which text is a bookmark, and so on. A logical structure tree of tags represents the
organizational structure of the document. Therefore, tags indicate the reading order and improve navigation,
particularly for long, complex documents without changing the PDF appearance.
Assistive software determines how to present and interpret the content of the document by using the logical structure
tree. Most assistive software depends on document structure tags to determine the appropriate reading order of text.
Document structure tags let assistive software convey the meaning of images and other content in an alternate format,
such as sound. An untagged document does not have structure information, and Acrobat must infer a structure based
on the Reading Order preference setting. This situation often results in page items being read in the wrong order or
not at all.
Reflowing a document for viewing on the small screen of a mobile device relies on these same document structure tags.
Often, Acrobat tags PDFs when you create them. To determine whether a PDF contains tags, choose File > Properties,
and look at the Tagged PDF value in the Advanced pane of the Description tab.
More Help topics
“Reading PDFs with reflow and accessibility features” on page 246
“Accessibility preferences” on page 247
“Creating accessible PDFs” on page 253
“Making existing PDFs accessible” on page 257
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