Bug 210025

Using a bluetooth mouse with iPad and the new mouse support in iPadOS, the pointer/hover/any-pointer/any-hover interaction media features https://drafts.csswg.org/mediaqueries-4/#mf-interaction don't reflect the presence of the mouse.

Testing with https://patrickhlauke.github.io/touch/pointer-hover-any-pointer-any-hover/ is shows that despite the mouse:

- pointer:fine
- any-pointer: fine
- hover:hover
- any-hover:hover

all evaluate to false.

pointer/hover relate to whatever the device/browser considers to be the "primary" input mechanism. So it comes down to deciding if iPad should treat the mouse as primary or not (i.e. if, even with mouse/trackpad present, it should consider the touchscreen its primary). However, regardless of that aspect, the any-pointer:fine and any-hover:hover feature query should evaluate to true (when the mouse/trackpad are present/paired, and ideally dynamically go back to false when no such pointing device is paired).