The sequence in which the various elements making up a Web page is almost never strictly top-to-bottom, the programming that fills in the missing pieces must do a certain amount of guesswork to determine how to best display partial content.
The sequence in which the various elements making up a Web page is almost never strictly top-to-bottom must do a certain amount of guesswork. This is to determine how to best display partial content. Top-to-bottom is the programming that fills in the missing pieces.