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This example demonstrates mouseenter and mouseleave events. Mouseenter and mouseleave events are triggered only when the mouse enters or leaves the parent container; unlike mouseover and mouseout, they are not triggered when the mouse moves between descendant elements. This makes it easier to listen for when the mouse enters a group of elements and avoid unnecessary flickering.

For browsers that do not yet support mouseenter and mouseleave events, D3 provides a polyfill on top of the mouseover and mouseout events.

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license: mit

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