The constructor TEX x returns an object which may contain one or more $\LaTeX$ equations and matrices, several simple text formatting environments, as well as other Hypertext items. It is useful to use strings delimited by /// because in strings delimited by " the backslashes often used in $\LaTeX$ must be doubled. For details on conversion to HTML see html(TEX).
The object TEX is an intermediate markup type, with ancestor classes Hypertext < BasicList < Thing.