<p>A flexbox can be either single-line or multi-line, depending on the 'flex-flow' property. A <dfn>single-line</dfn> flexbox lays out all of its children in a single line, even if that would cause the flexbox to overflow its bounds. A <dfn>multi-line</dfn> flexbox breaks its <i>flexbox items</i> across multiple lines to avoid overflowing, similar to how text is broken onto a new line when it gets too wide to fit on the existing line. Every line contains at least one <i>flexbox item</i>, unless the flexbox itself is completely empty.</p>
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