Presentation mode with a device mock
Have a presentation mode that would dim out the specs/attribute and place the artboard over a preselected (from a dropbown?) or defined mock of the device. For example, in an iOS project that has the dimensions of an iPhone 5s, dim the background and overlay the artboard on top a mock of the iphone.
Same for android/mobile web, desktop, etc.
When sharing design concepts to an engineering team, execs or other stakeholders, sometimes they need that little bit extra clarity to help them visualize your design.