Typography.Fraction Attached Property
Gets or sets a FontFraction enumerated value that indicates the fraction style.
Assembly: System.Windows (in System.Windows.dll)
This property gets or sets a value on the object that owns a Typography property, which is the only way to access a Typography class instance. In addition, this property supports an attached property usage so that it can be set on text-containing objects in XAML.
OpenType fonts support styles for fractions, including slashed and stacked.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.