Some content in an element may fall outside the element's rendering box for a number of reasons (negative margins, absolute positioning, content exceeding the width/height set for an element, etc.) In cases where this occurs, the 'overflow' property describes what to do with the content outside the elements rendering area.

blockquote { width: 50px; height: 50px; overflow: scroll }
some text

Possible Values
inherit: Explicitly sets the value of this property to that of the parent.
visible: Content is not clipped and may be rendered outside of the element's box.
hidden: Content is clipped and content outside of the element's box is not visible. The size of the clipping region is defined by the 'clip' property.
scroll: Content is clipped as necessary, but scrollbars are made available where necessary to view the additional, non-visible content. If the Visual media in use is static (such as Print) the content should be treated as if the value was 'visible'.
auto: This value is browser and media dependent, but should allow for a scrollbar if possible in case of overflow.

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