From http://www.w3schools.com (Copyright Refsnes Data)
The text-depth property specifies the "depth" for the descent below the dominant baseline.
| Value | Description |
|---|---|
| use-font-metrics | Default. Uses a value for the depth of the font below the baseline |
| length | Replaces the depth value in the font with a specified length |
From http://www.w3schools.com (Copyright Refsnes Data)