A11ying with Sanna - Web Content Accessibility Guidelines a guide to the accessibility requirements
1 Perceivable

1.3.4 Orientation

Conformance level: AA
Criterion released in WCAG version: 2.1

Official description of the success criterion

Content does not restrict its view and operation to a single display orientation, such as portrait or landscape, unless a specific display orientation is essential.

What to do?

Ensure content is operable in both portrait and landscape orientations.

Why is it important?

Provides flexibility for users who cannot change the orientation of their device.

Common pitfalls

Sometimes the orientation is locked to the portrait view.

How to test for it?

Check that the content can be viewed in both landscape or portrait view.

More about this criterion elsewhere