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<!DOCTYPE html>
<html>
<body>
<h1>HTML DOM Events</h1>
<h2>The oncontextmenu Event</h2>
<p>How to assign an "oncontextmenu" event to an element.</p>
<div id="div01" oncontextmenu="myFunction()" style="border:1px solid black; padding:10px">
<p>Right-click in this box to see the hidden content!</p>
</div>
<div id="myDiv" style="visibility:hidden">
<p>This info is hidden</p>
<p>This info is hidden</p>
<p>This info is hidden</p>
</div>
<script>
// Prevent default context menu:
const div = document.getElementById("div01");
div.addEventListener("contextmenu", (e) => {e.preventDefault()});
// Show hidden content:
function myFunction() {
  const div = document.getElementById("myDiv");
  div.style.visibility = "visible";
}
</script>
</body>
</html>