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Adds support for a "hover" event. The event provides a convenience wrapper for subscribing separately to mouseenter and mouseleave. The signature for subscribing to the event is</p>

<pre><code>node.on("hover", overFn, outFn); node.delegate("hover", overFn, outFn, ".filterSelector"); Y.on("hover", overFn, outFn, ".targetSelector"); Y.delegate("hover", overFn, outFn, "#container", ".filterSelector"); </code></pre>

<p>Additionally, for compatibility with a more typical subscription signature, the following are also supported:</p>

<pre><code>Y.on("hover", overFn, ".targetSelector", outFn); Y.delegate("hover", overFn, "#container", outFn, ".filterSelector"); </code></pre>