Unrecognized structural elements
Tags in a PDF document should only be used for visible elements.
Detailed explanation
The document contains a structural element at a specific location; however, the AI-assisted check does not detect any document content there. PAC 2026 issues a warning to indicate this discrepancy.
Example: Invisible text has been tagged as a paragraph.
| Cases | Result |
|---|---|
| The document contains a tag, but the AI-assisted check does not detect any document content in that area. | WARNING |
| The document contains a tag for which the AI-assisted check detects document content. | PASSED |