Just open the given element. Begin is either an atom or a
compound term, In the latter case the arguments are used as arguments to
the begin-tag. Some examples:
This predicate provides an alternative to using the
\Command syntax in the html//1 specification.
The following two fragments are the same. The preferred solution depends
on your preferences as well as whether the specification is generated or
entered by the programmer.
html(table([border(1), align(center), width('80%')],
html_begin(table(border(1), align(center), width('80%'))),