What does the “HR/” mean? Is it the same as “HR”? (I left out the “<” because they kept drawing LINES! :-) They seem to work the same?
HR surrounded by the carets will draw "horizontal rules" or lines... like this:
<hr>
You can get fancier... The following horizontal rule will get you a rule that is 75% of the window width, centered on the window, 10 pixels thick, gray. The "noshade" parameter is required or you won't see your line... you get an empty box effect.
<hr width="75%" size="10" noshade>
Width can also be defined in pixels. You can also do this:
<hr align="right" width="50%" size="15" noshade>
Or this:
<hr align="left" width="25%" size="35" noshade>
As to the slash after the HR? I haven’t got a clue... usually that means OFF... but only when used before it. The HR is a command that does not require a turn off command. So I am not sure why it is used here.