let test = document.getElementById("test");
test.addEventListener("mouseover", function( event ) {
alert("mouse over test!")
, false);let test = document.getElementById("test");
// This handler will be executed only once when the cursor
// moves over the unordered list
test.addEventListener("mouseenter", function( event ) {
// highlight the mouseenter target
event.target.style.color = "purple";
// reset the color after a short delay
setTimeout(function() {
event.target.style.color = "";
}, 500);
}, false);