This property is used to control the behavior of container in which its content expend over its content area. It is not used to control the behavior of container of the container of the content. Normally overflow will not happen because the container of content can expend vertically or horizontally. For text content is non-replaced elements, overflow horizontally will not happen because it can be wrapped into next line. But overflow overcritical y is possible. But for Replaced Elements it can overflow horizontally.