Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>This example uses the addEventListener() method on the window object.</p>

<p>Try resizing this browser window to trigger the "resize" event handler.</p>

<p id="demo"></p>

<script>
window.addEventListener("resize", function(){
    document.getElementById("demo").innerHTML = Math.random();
});
</script>

</body>
</html>