Programmatically determine DPI via the browser?

Question

I would like to programmaticaly determine the DPI of a user\'s display in order to show a web page at a precise number of units (centimeters/inches). I know it a weird request:

Answer 1

It's not possible from a browser without code running on the target computer. If you could install something on the target computer you might be able to determine enough about the monitor to calculate this.