From http://www.w3schools.com (Copyright Refsnes Data)
The letter-spacing property defines the space between characters.
| Value | Description |
|---|---|
| normal | Default is 0pt. The letter-spacing is normal |
| length | Indicates inter-character space in addition to the default space. Negative values are allowed |
| space | The user may specify a range of adjustments in addition to the default space |
From http://www.w3schools.com (Copyright Refsnes Data)