They're saying that because browsers render the HTML/CSS differently, the prints wouldn't look good. I don't think this is necessarily true, but even if it is,

They're saying that because browsers render the HTML/CSS differently, the prints wouldn't look good. I don't think this is necessarily true, but even if it is, CSS lets you style the print version of a page directly so that the print looks good, and you can even make it look like a normal document and not a printed web page