height = number; 

Specifies the height of a tile. Possible values are an integer or a real number representing the distance in character height units. Do not specify this value unless the assigned defaults do not have an acceptable appearance. You must specify, however, the height of image tiles and image buttons.

The height attribute specifies the minimum height of a tile. This dimension can be expanded when the tile is laid out, unless the height is fixed by one of the fixed_ attributes. Defaults are dynamically assigned based on layout constraints.

Character-height units are defined as the maximum height of screen characters (including line spacing).