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### A.2. Page markup—Boxes and rules

The theory of composing pages out of boxes lies at the very heart of TeX, and several LaTeX constructs are available to take advantage of this method of composition. A box is a rectangular object with a height, depth, and width. Its contents can be arbitrarily complex, involving other boxes, characters, spaces, and so forth. Once built it is used by LaTeX as a single, fixed object that behaves much like a (potentially huge) character. A box cannot be split and broken across lines or pages. Boxes can be moved up, down, left, and right. LaTeX has three types of boxes:

LR (left–right) The contents of this box are typeset from left to right. Line breaking is impossible and commands like \\ and \newline are ignored or produce error messages.

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