The “interaction” media features reflect various aspects of how the user interacts with the page. Allows a media query to be set based on the presence and accuracy of the user's pointing device, and whether they have the ability to hover over elements on the page. This includes the pointer, any-pointer, hover, and any-hover media features.
By the W3C (https://www.w3.org/TR/mediaqueries-4/#mf-interaction):
The pointer media feature is used to query the presence and accuracy of a pointing device such as a mouse. If multiple pointing devices are present, the pointer media feature must reflect the characteristics of the “primary” pointing device, as determined by the user agent. (To query the capabilities of any available pointing devices, see the any-pointer media feature.)
The hover media feature is used to query the user’s ability to hover over elements on the page with the primary pointing device. If a device has multiple pointing devices, the hover media feature must reflect the characteristics of the “primary” pointing device, as determined by the user agent. (To query the capabilities of any available pointing devices, see the any-hover media feature.)
