The MouseEvent.clientX read-only property provides the horizontal coordinate within the application's client area at which the event occurred (as opposed to the coordinates within the page). For example, clicking in the top-left corner of the client area will always result in a mouse event with a clientX value of 0, regardless of whether the page is scrolled horizontally.


var x = instanceOfMouseEvent.clientX

Return value

A number


<!DOCTYPE html> 
<title>clientX\clientY example</title>

function showCoords(evt){
    "clientX value: " + evt.clientX + "\n" +
    "clientY value: " + evt.clientY + "\n"

<body onmousedown="showCoords(event)">
<p>To display the mouse coordinates click anywhere on the page.</p>


Specification Status Comment
Document Object Model (DOM) Level 3 Events Specification
The definition of 'MouseEvent.clientX' in that specification.
Working Draft No change from Document Object Model (DOM) Level 2 Events Specification.
Document Object Model (DOM) Level 2 Events Specification
The definition of 'MouseEvent.clientX' in that specification.
Recommendation Initial definition.

Browser compatibility

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support (Yes) (Yes) 6 (Yes) (Yes)
Feature Firefox Mobile (Gecko) Android IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ?

See also


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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API CSSOM View DOM DOM Events MouseEvent Property Read-only Reference Référence