In Netscape, the NOSHADE attribute has an unexpected odd effect on HR elements. It usually creates a gray rule, with roughly rounded ends which are added to the HR WIDTH value on each side. This can effectively add the SIZE attribute to the specified WIDTH of the HR, as the radius of each of the rounded ends is about half of the SIZE attribute. (eg: <hr SIZE=40 WIDTH=100 NOSHADE> should create a rule in Netscape with rounded ends, with a height of 40px and an apparent total length of around 140px.)