What this test checks
This test checks whether non-interactive (read-only) form fields in the PDF document are correctly tagged. This test is applicable only if the PDF document contains an interactive form.
Why this maybe a barrier
Non-interactive or read-only fields in PDF forms need to be tagged with a PrintField attribute.
Assistive technologies rely on PrintField tagging to expose non-interactive form content in a consistent manner. Missing or incorrect tagging of PrintField attributes on such form elements cause loss of form semantics for screen readers.
WCAG 2.2 Success Criterion
N.A (PDF/UA-only check).
PDF/UA Principle
Section 7.14: Non-interactive Forms — "Non-interactive forms shall be tagged using the PrintField attributes, as defined in ISO 32000-1:2008, 14.8.5.6."
For implementation, it uses the Matterhorn protocol checkpoint namely 24-001:
24-001 — Non-interactive forms are not tagged with the PrintFields attribute..