HTML | DOM MouseEvent offsetX Property

Last Updated : 13 Jun, 2022

The MouseEvent offsetX property is a read-only property which is used for returning the x-coordinate of the mouse pointer, relative to the target element.

Syntax :

event.offsetX

Return Value: It returns a number which represents the horizontal coordinate of the mouse pointer, in pixels.

Below program illustrates the MouseEvent offsetX property:

Example: Finding out the horizontal coordinate of the mouse pointer relative to a <div> element.

html

<!DOCTYPE html>
<html>
 
<head>
    <title>MouseEvent offsetX Property in HTML</title>
    <style>
        div {
            border: 3px solid green;
            height: 100px;
            width: 500px;
        }
         
        h1 {
            color: green;
        }
         
        h2 {
            font-family: Impact;
        }
         
        body {
            text-align: center;
        }
    </style>
</head>
 
<body>
 
    <h1>GeeksforGeeks</h1>
    <h2>MouseEvent offsetX Property</h2>
 
    <p>Click inside the green box to get 
      the x-coordinate relative to the top edge.</p>
 
    <div onclick="coord(event)"></div>
 
    <p>The x-coordinate, relative to 
      the top edge of the DIV element is: 
      <span id="test"></span></p>
 
    <script>
       
        function coord(event) {
           
            var c = event.offsetX;
            document.getElementById(
              "test").innerHTML = c;
        }
    </script>
 
</body>
 
</html>