<summary>
Specifies the Y coordinate of a glyph's vertical origin, in the font's design coordinate system.
The y coordinate of a glyph's vertical origin is the sum of the glyph's top side bearing
and the top (i.e. yMax) of the glyph's bounding box.
</summary>
<summary> Specifies the Y coordinate of a glyph's vertical origin, in the font's design coordinate system. The y coordinate of a glyph's vertical origin is the sum of the glyph's top side bearing and the top (i.e. yMax) of the glyph's bounding box. </summary>