The $.cssHooks object provides a way to define functions for getting and setting particular CSS values. It can also be used to create new cssHooks for normalizing CSS3 features such as box shadows and gradients.

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For example, some versions of Webkit-based browsers require -webkit-border-radius to set the border-radius on an element, while earlier Firefox versions require -moz-border-radius. A css hook can normalize these vendor-prefixed properties to let .css() accept a single, standard property name (border-radius, or with DOM property syntax, borderRadius).

In addition to providing fine-grained control over how specific style properties are handled, $.cssHooks also extends the set of properties available to the .animate() method.