Mobile VS Desktop Visibility Dependency

Overall request:
Ability to hide/show elements based on whether the user is viewing on desktop or mobile.

Use-Case:
Many websites are setup with a desktop site and mobile site - (salesforce.com vs my.salesforce.com). Is there a way to set visibility requirements for links based on whether the user is viewing on a desktop or mobile app?

Currently, I have two links listed for my users - one for the desktop website link and one to the mobile link. It would be great to be able to hide one or the other based on whether they are viewing on desktop or mobile.

Thanks!

I very much agree - a needed feature! (for some apps especially!)