Box Model

In Cascading Style Sheets, the box model refers to the rectangular boxes that are generated for elements in the document tree and laid out as specified in the visual formatting model. Every element generates a box, which is call the element box. As the word ""box"" implies, these are rectangular in shape Each box is made up of a number of parts. In the normal document flow, the element boxes of block-level elements cannot overlap each other (floats and positioning are the exceptions). In other words, the way a page is laid out depends on the size of each and every box. Going down the page, in broad terms, each box begins just below where the previous one ends. For more information See Box Model.

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