Gets or sets whether the phantom is transparent for spacing.

This means that if the contents of the phantom belong to a special spacing class (such as binary operators, relational operators, differentials, etc.), the contents of that phantom are taken into consideration when laying out text. If transparency is turned off, then the contents of the phantom are ignored during layout.

The default value is false.

In Microsoft Word, if transparency is off, special spacing is not added before and after the phantom, but the contents are not ignored during layout.

In Microsoft Word, transparency does not work as specified unless the phantom contains another math function and does not start or end with a math operator.