The onmouseenter property of the GlobalEventHandlers mixin is the event handler for processing mouseenter events.

The mouseenter event is fired when a pointing device (usually a mouse) is moved over the element that has the listener attached.

element.onmouseenter = handlerFunction;
var handlerFunction = element.onmouseenter;

handlerFunction is either null or a JavaScript function specifying the handler for the event.

• mouseenter
• DOM event handlers