This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)


This token has not been fully integrated into the long-term Mathematica system, and is subject to change.

is a front end token that creates a FractionBox and fills the numerator with a selection.
  • fills the numerator with the subexpression to the left of the selection if it is an insertion point.