(Graphical interfaces only)
Returns the height, in pixels, of the specified font. If no font is specified, the method returns the height of the default font.
Return type: INTEGER
Applies to: FONT-TABLE system handle
If you pass the Unknown value (?) to this method, the AVM uses the system default font. When a field-level widget inherits its font from the parent frame, the AVM returns the Unknown value (?) for the font and you must use the font of the parent frame.