property FormatConditionalAppearance.OutlineSize as Long
Indicates the size of the outline to be applied on text.

TypeDescription
Long A Long expression that defines the size of the outline text.
By default, the OutlineSize property is 1. If 0, the Outline has no effect. The OutlineSize property specifies the size of the outlined text/line. The Expression property defines the conditional expression that determines whether the current format is applied on the pivot's cell based on the cell's value.

The following properties can be applied on objects:

Also, the decorative text is allowed as following: