These are high-level layouting tags for preserving whitespace which use the
"<imgdot>" tag from wml::des::imgdot(3). Use them to create
whitespace on a webpage.
"<space" ["width="X] ["height="Y]">"
Creates a 1pt transparent dot-image and resizes it to the size X times Y in
points, so a rectangular white area if size XxY is the effect.
"<hspace" X">"
Creates a horizontal line, i.e. a rectangular area of size Xx1.
"<vspace" Y">"
Creates a vertical line, i.e. a rectangular area of size 1xY.
"<over" X">"..."</over>"
This pushs over contained body X pixels to the right.