(eplain.info)Boxes

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4.21 Boxes
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The solid rectangle that Eplain uses as a marker in unordered lists
(Note: Lists) is available by itself: just say '\blackbox'.

   You can create black boxes of arbitrary size with '\hrule' or
'\vrule'.

   You can also get unfilled rectangles with '\makeblankbox'. This takes
two explicit arguments: the height and depth of the rules that define
the top and bottom of the rectangle. (The two arguments are added to get
the width of the left and right borders, so that the thickness of the
border is the same on all four sides.) It also uses, as implicit
arguments, the dimensions of '\box0' to define the dimensions of the
rectangle it produces. (The contents of '\box0' are ignored.)

   Here is an example. This small raised open box is suitable for
putting next to numbers in, e.g., a table of contents.

     \def\openbox{%
       \ht0 = 1.75pt \dp0 = 1.75pt \wd0 = 3.5pt
       \raise 2.75pt \makeblankbox{.2pt}{.2pt}
     }

   Finally, you can put a box around arbitrary text with '\boxit'. This
takes one argument, which must itself be a (TeX) box, and puts a printed
box around it, separated by '\boxitspace' white space (3 points by
default) on all four sides. For example:

     \boxit{\hbox{This text is boxed.}}

   The reason that the argument must be a box is that when the text is
more than one line long, TeX cannot figure out the line length for
itself. Eplain does set '\parindent' to zero inside '\boxit', since it
is very unlikely you would want indentation there. (If you do, you can
always reset it yourself.)

   '\boxit' uses '\ehrule' and '\evrule' so that you can easily adjust
the thicknesses of the box rules. Note: Rules.