which puts a line on the screen. The HR tag can be sized in either direction. For example you can have a line which goes 50 percent of the distance across your browser window:
Line width can also be dictated by points rather than percentage, such as this 100-point line
You can make the line thicker by changing its size, which is normally set at 1 point. A 10-point line is thicker, though it usually displays in outline form.
But by using the "noshade" attribute you can make it appear black.
You can even go nuts and make the width very small and the size large, therefore creating a vertical line:
. . . but there's not much use for that.