Browser font size selection for printer

[Hendrik Boom <hendrik@topoi.pooq.com>]

I cannot get chrome or chromium (or Iceweaasel either) to print a web 
page in a twelve-point font on my laser printer.  It insists on using a 
font that's about twice the size.

It even ignores my explicit request to set font-size in the css file:

@media print{
    account-tree{
	display: block;
	margin: 10;
	font-weight: bold;
	font-size: 12pt;
    }
}
@media screen{
    account-tree{
	display: block;
	margin: 10;
	font-weight: bold;
    }
}

Further, there seems to be no setting option for this in any of these 
browsers.  The large font is destroying my page layout (which looks 
perfectly OK in the browser itself).

I can adjust text size on the  screen with control-plus and control-
minus, but there sees to be no way to do this for printer output.

-- hendrik