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