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<html><body onwheel="myFunction(event)"><h1>WheelEvent deltaX Property</h1><p>Scroll this page to see the value of the deltaX property.</p><p><strong>Note:</strong> Most mouse devices do not have the ability to scroll left and right, and will always return 0.</p><p id="demo"></p><script>function myFunction(event) { var x = event.deltaX; document.getElementById("demo").innerHTML = x;}</script></body></html>