Operation Manual

254
USING ACROBAT X STANDARD
Accessibility, tags, and reflow
Last updated 10/11/2011
Tag the PDF
Improve the accessibility of PDFs by adding tags in Acrobat. If a PDF doesn’t contain tags, Acrobat attempts to tag it
automatically when users read or reflow it, and the results may be disappointing. With a tagged PDF, the logical
structure tree sends the contents to a screen reader or other assistive software or hardware in an appropriate order.
For best results, tag a document when converting it to PDF from an authoring application. Examples of these
applications include Adobe FrameMaker®, Adobe InDesign®, Microsoft Word, or OpenOffice Writer. If you do not
have access to an authoring application that can generate a tagged PDF, you can tag a PDF any time by using Acrobat.
Tagging during conversion to PDF requires an authoring application that supports tagging in PDF. Tagging during
conversion enables the authoring application to draw from the paragraph styles or other structural information of the
source document to produce a logical structure tree. The logical structure tree reflects an accurate reading order and
appropriate levels of tags. This tagging can more readily interpret the structure of complex layouts, such as embedded
sidebars, closely spaced columns, irregular text alignment, and tables. Tagging during conversion can also properly tag
the links, cross-references, bookmarks, and alternate text (when available) that are in the file.
To tag a PDF in Acrobat, choose Tools > Accessibility > Add Tags To Document. This command works on any
untagged PDF, such as one created with Adobe PDF Printer. Acrobat analyzes the content of the PDF to interpret the
individual page elements, their hierarchical structure, and the intended reading order of each page. Then, it builds a
tag tree that reflects that information. It also creates tags for any links, cross-references, and bookmarks that you added
to the document in Acrobat.
The Add Tags To Document command adequately tags most standard layouts. However, it cannot always correctly
interpret the structure and reading order of complex page elements. These elements include closely spaced columns,
irregular text alignment, nonfillable form fields, and tables that don’t have borders. Tagging these pages by using the
Add Tags To Document command can result in improperly combined elements or out-of-sequence tags. These issues
cause reading order problems in the PDF.
Create a tagged PDF from a web page
A PDF that you create from a web page is only as accessible as the HTML source that it is based on. For example, if the
web page relies on tables for its layout design, the HTML code for the table may not flow in the same logical reading
order as a tagged PDF would require, even though the HTML code is sufficiently structured to display all the elements
correctly in a browser.
To produce the most accessible PDFs from web pages you create, first establish a logical reading order in their HTML
code. For best results, employ the Web Content Accessibility Guidelines that are published by the World Wide Web
Consortium (W3C). For more information, see the guidelines on the W3C website.
1 Do one of the following:
• In Acrobat, choose File > Create > PDF From Web Page, enter the web page address, and then click Settings.
• In Microsoft Internet Explorer, in the Adobe PDF toolbar, click the down arrow on the Convert button and choose
Preferences.
2 In the General tab, select Create PDF Tags, and then click OK.
3 Specify any other options as appropriate, and then click Create.
Creating a tagged PDF from an authoring application
In most cases, you create tagged PDFs from within an authoring application, such as Adobe FrameMaker®, Adobe
InDesign, or Microsoft Word. Creating tags in the authoring application generally provides better results than adding
tags in Acrobat.