On iPadOS it ignores pointer and external keyboard. Wish their apps were more native to the platforms.
This is the downside of webapps, they have to reimplement all the UX that native apps have builtin. In this case, Apple updated things like buttons and text inputs in their native components, so any app using those didn't have to do anything to make it work as expected.
(On macOS, don't know if this is the case on other OSes)