<summary>
The strikethrough position value of the font face in font design units.
Strikethrough position is the position of strikethrough relative to the English baseline.
The value is usually made positive in order to place the strikethrough above the baseline.
</summary>
<summary> The strikethrough position value of the font face in font design units. Strikethrough position is the position of strikethrough relative to the English baseline. The value is usually made positive in order to place the strikethrough above the baseline. </summary>