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HTML | DOM MouseEvent offsetX Property

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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 :


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. 


<!DOCTYPE html>
    <title>MouseEvent offsetX Property in HTML</title>
        div {
            border: 3px solid green;
            height: 100px;
            width: 500px;
        h1 {
            color: green;
        h2 {
            font-family: Impact;
        body {
            text-align: center;
    <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>
        function coord(event) {
            var c = event.offsetX;
              "test").innerHTML = c;


  • After clicking the button: 

  • After clicking the button: 

Supported Browsers:

  • Opera 12.1 and above
  • Internet Explorer 9 and above
  • Google Chrome 1 and above
  • Edge 12 and above
  • Firefox 39 and above
  • Apple Safari 1 and above

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Last Updated : 13 Jun, 2022
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