<summary>
Cap height value of the font face in font design units.
Cap height is the distance from English baseline to the top of a typical English capital.
Capital "H" is often used as a reference character for the purpose of calculating the cap height value.
</summary>
<summary> Cap height value of the font face in font design units. Cap height is the distance from English baseline to the top of a typical English capital. Capital "H" is often used as a reference character for the purpose of calculating the cap height value. </summary>