<+n> -- create n additional horizontal space (float n)
<-n> -- for negative spacing
beware of
always use a <p> tag after ending a list or display.
Also, the filtering is done on an as best as possible
basis. In some cases it will be very hard to get
what you want.
Actually, since it is a legaccy format, you're not even supposed to use
it. So, why bother.