From http://www.w3schools.com (Copyright Refsnes Data)
The height property specifies the content height of a box.
| Value | Description |
|---|---|
| auto | Default. The browser calculates the actual height |
| length | Specifies a fixed height in px, cm, etc. Negative values are not allowed |
| % | Defines the height in % of the parent element's height |
From http://www.w3schools.com (Copyright Refsnes Data)