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HTML | DOM MouseEvent offsetX Property
  • Last Updated : 31 Jan, 2019

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
  • Internet Explorer
  • Google Chrome
  • Firefox
  • Apple Safari

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