<summary>
Specifies the X offset from the glyph origin to the left edge of the black box.
The glyph origin is the current horizontal writing position.
A negative value means the black box extends to the left of the origin (often true for lowercase italic 'f').
</summary>
<summary> Specifies the X offset from the glyph origin to the left edge of the black box. The glyph origin is the current horizontal writing position. A negative value means the black box extends to the left of the origin (often true for lowercase italic 'f'). </summary>