Standing at the counter of a local electrical retailer I noticed some mp3 players hanging on a rack. The fine print said "Compatible with Windows, Mac, Linux".
Later I bought a new monitor at the computer store. The fold out install guide included a paragraph on setting up X on Linux to work with the monitor.
Checked the documentation for the monitor I bought last year - no mention. Ditto for my old mp3 player. It's like that singer guy said: "The times they are a-something-0r-other."