What does this mean?

Headings in a PDF should follow the sequence Heading 1 -> Heading 2 -> Heading 3 without skipping intermediate headings.

It is acceptable to 'go back' to previous styles/headings but the sequence should then continue without missing headings.

See WCAG



63.1% done

How close this website is to fixing this issue.

121 distinct issues were found in the sample of 12 web pages.
More results from Advisory Committee on Animal Feeding stuffs