When the form is rendered, if an object that merges data expands so much that it will no longer fit in one content area, the object spills into the next and subsequent content areas. Similarly, when you are designing a form, you cannot add more objects to a content area than will fit within the area bounded by the content area. As soon as the content area has been filled, the remaining objects overflow into the next available content area. If another content area is not available to catch the overflow, the data will not be rendered properly.