These issues cause reading order problems in the PDF. Tagging these pages using the Automatically tag a PDF command can result in improperly combined elements or out-of-sequence tags. These elements include closely spaced columns, irregular text alignment, non-fillable form fields, and tables that don’t have borders. However, it cannot always correctly interpret complex page elements' structure and reading order. The Automatically tag a PDF command adequately tags most standard layouts. It also creates tags for any links, cross-references, and bookmarks you added to the document in Acrobat. Then, it builds a tag tree that reflects that information. Acrobat analyzes the content of the PDF to interpret the individual page elements, their hierarchical structure, and the intended reading order of each page. This command works on any untagged PDF, such as one created with Adobe PDF Printer. To tag a PDF in Acrobat, choose All tools > Prepare for accessibility > Automatically tag a PDF. Tagging during conversion can also properly tag the links, cross-references, bookmarks, and alternate text (when available) in the file. This tagging can more readily interpret the structure of complex layouts, such as embedded sidebars, closely spaced columns, irregular text alignment, and tables. The logical structure tree reflects an accurate reading order and appropriate levels of tags. Tagging during conversion enables the authoring application to draw from the source document's paragraph styles or other structural information to produce a logical structure tree. Tagging during conversion to PDF requires an authoring application that supports tagging in PDF. If you don't have access to an authoring application that can generate a tagged PDF, you can tag a PDF any time by using Acrobat. Examples of these applications include Adobe FrameMaker®, Adobe InDesign®, Microsoft Word, or OpenOffice Writer. Tag a document when converting it to PDF from an authoring application for best results. 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. 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. Improve the accessibility of PDFs by adding tags in Acrobat.
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