Detect "Desktop Mode" on mobile devices

**Is your feature request related to a problem? Please describe.**
I want to understand if my application is running on a mobile device, but in 'Desktop Mode'

**Describe the solution you'd like**
I would like a new flag (true/false) isDesktopMode, that will tell me if the browser is running on a mobile device running in desktop mode.

**Describe alternatives you've considered**
I could implement a check on my software, but think it would be better for the community if we are able to have this here.

**Additional context**
Mobile devices have limited resources and just due to it running in desktop mode, it doesn't mean it has the resource of it. As a developer, I would like to know what device it really is.