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MouseEvent: clientX property - Web APIs | MDN
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MouseEvent: clientX property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The clientX read-only property of the MouseEvent interface provides the horizontal coordinate within the application's viewport at which the event occurred (as opposed to the coordinate within the page).
For example, clicking on the left edge of the viewport will always result in a mouse event with a clientX value of 0, regardless of whether the page is scrolled horizontally.
Value
A double floating point value in pixels.
Examples
This example displays your mouse's coordinates whenever you trigger the mousemove event.
HTML
html
<p>Move your mouse to see its position.</p>
<p id="screen-log"></p>
JavaScript
js
let screenLog = document.querySelector("#screen-log");
document.addEventListener("mousemove", logKey);
function logKey(e) {
screenLog.innerText = `
Screen X/Y: ${e.screenX}, ${e.screenY}
Client X/Y: ${e.clientX}, ${e.clientY}`;
}
Result
Specifications
| Specification |
|---|
| UI Events # dom-mouseevent-clientx |
Browser compatibility
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