The height property defines the Widget's height.

If the value is positive, it simply defines the Widget's height.
If the value is negative, the Widget's height is defined by (resolution_y - abs(height)).
Click the "flip" button to switch between these two modes.

The height property can be given in absolute pixels or in percent and can be negative or positive. Hence the value could have these forms:

Click the "flip" button to convert between positive and negative representation (preserving the absolute value) and click the "px" or "%" button to convert between pixels and percent (preserving the absolute value).