Screen readers don’t read alternate text for nested elements.
If alternate text does exist in your PDF’s nested elements, you will see the Nested alternate text -failed error when using the Accessibility Checker in Adobe Acrobat Pro DC.
Here’s how to fix the problem:
1) In Adobe Acrobat Pro DC Accessibility Checker sidebar, right-click (Windows) or Ctrl-click (Mac OS) on the error, then select Show in Tags panel.
2) In the Tags panel, Right-click (Windows) or Ctrl-click (Mac OS) on the nested element and choose Properties from the context menu.
3) Remove the Alternate Text from the Object Properties dialog box, and then click the Close button.
4) Save the PDF file.
5) Test the PDF again in using the Adobe Acrobat DC Pro Accessibility Checker.
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