Containing Block

Every web page has a container. This could be in the form of the page’s body tag, an all-containing div tag, or (and I really don’t want to say this, but) a table. Without some sort of container, we would have no place to put the contents of our page. The elements would drift beyond the bounds of our browser window and off into empty space. The width of the container can be liquid, meaning it expands to fill the width of the browser window; or fixed, so that the content is the same width no matter what size the window is.