The mobile version of the registration page should be tested with special attention, since most users register from mobile devices. The article at
https://testsigma.com/blog/test-cases-for-registration-page/ explains how to create tests for mobile versions to check the responsiveness of the interface on various devices and resolutions. It is important to ensure that all page elements such as input fields, buttons, and forms work correctly on small screens, and that the page loads quickly and is easy to use on mobile devices.