Try it Yourself - JavaScript Reference oncontextmenu

<!DOCTYPE html>
<html>
<head>
<style>
div {
    background: yellow;
    border: 1px solid black;
    padding: 10px;
}
</style>
</head>
<body>

<p>This example uses the addEventListener() method to attach a "contextmenu" event to a div element.</p>

<div id="myDIV" contextmenu="mymenu">
<p>Right-click inside this box to see the context menu!

</div>

function myFunction() {
    var x = document.getElementById("demo");
    x.innerHTML = "You right-clicked inside div!";
    x.style.fontSize = "30px";
}
</script>

<p><strong>Note:</strong> The contextmenu <strong>attribute</strong> only works in Firefox!</p>

</body>
</html>