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element.onmouseenter = handlerFunction; var handlerFunction = element.onmouseenter;
handlerFunction should be either
See the DOM event handlers page for information on working with
mouseenter event is fired when a pointing device (usually a mouse) is moved over the element that has the listener attached.
mouseenter event documentation for more information about the event.
|WHATWG HTML Living Standard
The definition of 'mouseenter' in that specification.