Annotations such as comments and editorial marks (for example, highlighted content) should be included in the Tags tree if they are meaningful, according to Adobe. Comments and editorial marks that are purely decorative or are duplicated in the document should be marked as artifacts.

If a document fails the Tagged Annotations item in the Accessibility Checker, Acrobat can automatically fix this issue. In the Tags panel, open the Options menu and select "Tag Annotations." When selected, all new comments and editorial marks are added to the tag tree; existing comments and form fields aren’t added to the tag tree. Highlight and Underline comments are automatically associated and tagged with the text that they annotate and don’t require this option.

There is a search function for unmarked annotations. In the Tags panel, open the Options menu and select "Find." In the "Find Element" drop-down box, select "Unmarked Annotations." Acrobat will highlight unmarked annotations. Click the "Tag Element" button in the dialog box and choose the appropriate tag to tag the annotation. Click "Close" when finished.

Comments

Within the Tags panel, open the Options menu and select "Find." In the "Find Element" drop-down box, select "Unmarked Comments." Acrobat will highlight unmarked annotations. Click the "Tag Element" button in the dialog box and choose the appropriate tag to tag the annotation. Click "Close" when finished.

Links and form fields

Links and form fields require object tags in order to be accessible. It is not enough to simply place the content under a link or form tag in the tags tree. The object tag must also be present as a child of the parent link or form tag in the tree along with the corresponding text node. 

In the Tags panel, find the parent element in the tags tree to insert the link or form field. If a parent element does not exist, it must be created first. Choose "Find" from the Options menu. In the "Find Element" drop-down box, select "Unmarked Links" to find and tag links or "Unmarked Annotations" to find and tag form fields. Click the "Find" button. Acrobat will highlight unmarked links or unmarked annotations. Click the "Tag Element" button and select the appropriate tag for the unmarked item. Select "Find Next" and tag all unmarked links or annotations. Click "Close" when finished.

A user finds unmarked links in a PDF using Adobe Acrobat Pro.


WCAG requirements: 1.3.1 Info and Relationships4.1.2 Name, Role, Value