The “Inappropriate Complementary Landmarks Check” evaluates whether there is any complementary landmark nested within another region’s landmark.
Example outcome
I noticed that the complementary landmark is contained within other landmark.
Impact
Visual Impairments: Screen readers may not recognize or expose the complementary region, or they may misrepresent its relationship to the main content.
Motor Impairments: Users who depend on keyboard shortcuts to jump between landmark regions may not be able to access the complementary section efficiently.
Cognitive Disabilities: Page layout may seem illogical or inconsistent, especially if multiple sections are indistinct or repeated.
Fixes
To address inappropriate complementary landmarks:
Locate the inappropriately placed complementary landmark.
Remove it from within the landmark in which it is nested.