In theory EDID (or ‘DisplayID’ if anyone has ever actually shipped that); should include the physical size of the display, in addition to resolution and the assorted other stuff necessary to drive it properly.
In practice? Let’s just say that the excellent of ‘smart TV’ firmware has a rich and noble ancestry in vendors not even being able to get a static description of their device’s capabilities right, so I wouldn’t bet on it.
For some reason the site detected my 28" as 45.9", which didn’t do the results any good. Got the resolution right however.
