See also the Netscape Navigator HTML Tag Reference:   Formatting Tags

The <hr> tag stands for "Horizontal Rule" and is used to
produce a line on the screen. The width and height of the
line can be adjusted with attributes. Notice, though, that
unless told otherwise, the lines will be centered.


<hr noshade>

<hr noshade width=400>

<hr noshade width=50%>

<hr noshade size=50>