OverflowEvent

void initOverflowEvent(
    in unsigned short orient, 
    in boolean horizontalOverflow, 
    in boolean verticalOverflow); 

const unsigned short BOTH = 2; 

const unsigned short HORIZONTAL = 0; 

readonly attribute boolean horizontalOverflow; 

readonly attribute unsigned short orient; 

const unsigned short VERTICAL = 1; 

readonly attribute boolean verticalOverflow;