This page demonstrates precise rectangles, including precise placement.
Following is a horizontal rule (HR), with no parameters:
followed by text.
 
Here is an HR
36/720 high. Here is one
two inches wide.
Following are HRs in various colors, with various outlines. Note that handling
of colors varies by printer.
white

Gray

gray50

gray25

#FF0000 = red

#00FF00 = green

#FFFF00 = yellow

#0000FF = blue

#FF00FF = magenta

#00FFFF = cyan

#FFFFFF = white

In the lower right corner is a rectangle that should be exactly
10 inches from the top of the page, and 7.5" from the left.