Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>This example uses the HTML DOM to assign an "onmouseenter" and "onmouseleave" event to a h1 element.</p>

<h1 id="demo">Mouse over me</h1>

<script>
document.getElementById("demo").onmouseenter = function() {mouseEnter()};
document.getElementById("demo").onmouseleave = function() {mouseLeave()};

function mouseEnter() {
    document.getElementById("demo").style.color = "red";
}

function mouseLeave() {
    document.getElementById("demo").style.color = "black";
}
</script>

</body>
</html>