What this test checks
This test checks if image captions in the PDF document are present and are tagged correctly.
Why this maybe a barrier
Captions provide important context in the form of text for images, and it is important for the information to be labeled correctly.
If image captions are not tagged correctly in the structure tree, assistive technology may confuse it with normal text in the vicinity of the image and this can have an impact in the way assistive technology processes image information.
WCAG 2.2 Success Criterion
N.A (PDF/UA-only check)
PDF/UA Principle
Section 7.3: Graphics— "A caption accompanying a figure shall be tagged with a Caption tag". For implementation it uses the Matterhorn protocol checkpoint namely 13-003:
13-003 — A caption is not tagged with a <Caption> tag.