Webmaster Forum / HTML, CSS, Scripts / JavaScript / May 2005

Perhaps you received no answer because how a user agent prints a page
depends on the user agent, on the operating system and on the printer
driver, 3 things we can't know in your environment. The question is also
off-topic for comp.lang.javascript, since there is little that could be
done in JavaScript to change the width of "a line" (where and how these
lines appeared was never described) - and almost anything that could be
done in JavaScript to control the width of "a line" could also be done
using CSS.

Example using table borders for your definition of "a line":

<style type="text/css">
table.x, table.x td {
   border: 1px solid Black;
}
@media print {
   table.x, table.x td {
       border-collapse: collapse;
   }
}
</style>
<table cellpadding="2" cellspacing="0" class="x">
<tr><td>TEST</td></tr>
</table>