Specify hairline thickness in CSS for printing

Question

If I have a print CSS styling an element with:

border:1px solid black;

or:

border:0.25pt solid black;

The lin

Answer 1

Problem might be in browser rescaling the page (at least IE used to do it when printing), but as I tested it now in Opera (no rescale), line still isn't really thin as hairline. However, I am always using this to achieve thin border effect:

p {
  border: 0.4pt solid #CCC;
}

This will create very light gray border. As Barry Kaye has proposed, you can also make it dotted to look thinner.