Selenium can use Chromedriver's device emulation mode (eg "add_experimental_option("mobileEmulation", {"deviceName": "iPhone X"})") to enable touch events, pixel density, etc. It's not the same as testing on a real device but it's still useful to have as part of a test pipeline if you don't have the budget for every device you need to test on.

https://chromedriver.chromium.org/mobile-emulation