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Block Formatting
In a block formatting context, boxes are laid out vertically, starting at the top.
Block-level elements??”elements with a display property value of block, list-item,
table, and (in certain circumstances) run-in??”participate in block formatting
contexts.
A block-level element with a display property value other than table will generate
a principal box block. A principal box will contain either block boxes or inline
boxes as children, never both. If the element contains a mix of block-level and inline
children, anonymous block boxes will be generated where necessary, so that the
principal box will only contain block boxes. Consider the following example:
165 CSS Layout and Formatting

The HTML snippet above will, by default, generate a principal box for the div
element and the two p elements, plus an anonymous block box for the text that
appears between the paragraphs, as seen in Figure 6.


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