Specifying phyiscal size in CSS (e.g. 2 inches) when printing a web page

Is there a reliable way to specify physical dimensions in CSS such that when the page is printed, my elements are at a specific size and position on the printed page? I see that CSS has units for in and cm, but (not surprisingly) neither Firefox nor Chrome actually printed the box at 2x2 inches when I did the following: ``` .test { width: 2in; height: 2in; border: solid 1px #aaa; } ``` Am I being too optimistic hoping that there is some way of specifying the size and having the browser adjust it's printing size based on the resolution of the printer etc? Thanks.