<summary>
If true, specifies that glyphs are rotated 90 degrees to the left and
vertical metrics are used. Vertical writing is achieved by specifying
isSideways = true and rotating the entire run 90 degrees to the right
via a rotate transform.
</summary>
<summary> If true, specifies that glyphs are rotated 90 degrees to the left and vertical metrics are used. Vertical writing is achieved by specifying isSideways = true and rotating the entire run 90 degrees to the right via a rotate transform. </summary>