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HTML | DOM WheelEvent deltaZ Property
  • Last Updated : 17 Jun, 2019

The HTML | DOM WheelEvent deltaZ Property is used to return a positive double value when the web page is scrolled in and returns a negative value when the page is scrolled out else it returns zero. It is a read-only property.



Return Value: It returns a double value which indicates the scrolling direction of the mouse wheel.


<!DOCTYPE html>
      DOM WheelEvent deltaZ Property
<body onwheel="Geeks(event)" 
      style="text-align: center; 
             width: 1000px;">
    <h1 style="color: green;"
        DOM WheelEvent deltaZ Property 
    <p>Scroll to see effect:</p>
    <p id="p"></p>
        function Geeks(event) {
            var doc = event.deltaZ;
              "p").innerHTML = doc;

Before Scroll:

After Scroll:

Supported Browsers: The browsers supported by DOM WheelEvent deltaZ Property are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
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