<summary> Add font feature. </summary> <param name="fontFeature">The font feature to add.</param> <returns> Standard HRESULT error code. </returns>
<summary> Get the font feature at the specified index. </summary> <param name="fontFeatureIndex">The zero-based index of the font feature to get.</param> <param name="fontFeature">The font feature.</param> <returns> Standard HRESULT error code. </returns>
<summary> Get the number of font features. </summary>
<summary> Font typography setting. </summary>