Tagging is essential for PDF accessibility. Tags establish logical reading order and to provide a means for indicating structure and type, adding alternative text descriptions to non-text elements and substitute text (referred to as actual text) for elements in the PDF document.
If you’ve followed each step so far, your PDF document is searchable either from optical character recognition or through the native document conversion. Any desired interactivity has been added in the form of navigational controls or interactive form fields. The next step is to add tags to the document if it has not been tagged. This section addresses the addition of tags, while “Step 7: Examine and Repair the Tag Structure” explains how to fix tags and properly tag complex layouts and elements.
Note: If the PDF document has been tagged, skip this discussion and proceed to “Step 7: Examine and Repair the Tag Structure.”