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WCAG: 1.3.4: CSS Media queries are not used to lock display orientation
The screen orientation (e.g. portrait or landscape) of mobile applications should not be locked in one mode. Users should be able to change the orientation of their device between portrait and landscape with the page adjusting accordingly in order to remain understandable. Also, when opening a page, it should display in the user’s current orientation.
Assistive technology users may be unable to access orientation features with their devices or assistive technologies.