The letter spacing in milli-em units.
1000 equals 1em (the width of the current font size). Use positive values to increase spacing or negative values to tighten.Support
Usage
Wide letter spacing
Tight letter spacing
Heading with tracking
Notes
trackinguses milli-em units where 1000 = 1em. For example,tracking(500)at a 16pt font size adds 8pt of spacing between each character.- This is equivalent to CSS
letter-spacingbut uses a different unit scale.