replaced elements definition
An element can be classified as either a nonreplaced element or a replaced element. Replaced elements are elements whose content is replaced by an item not immediately portrayed by the content of the document. In other words, the element does not contain any content - just the element’s name and attributes are present. Such an element can only be presented by inserting content through other methods since no content is contained in the element. The img element is an example of a replaced element; it contains no content, but by inserting an external image through the use of a src attribute the image can be viewed by the user.