dom / latest / mouseevent / clienty.html /

MouseEvent.clientY

The clientY read-only property of the MouseEvent interface provides the vertical coordinate within the application's viewport at which the event occurred (as opposed to the coordinate within the page).

For example, clicking on the top edge of the viewport will always result in a mouse event with a clientY value of 0, regardless of whether the page is scrolled vertically.

Value

A double floating point value.

Examples

This example displays your mouse's coordinates whenever you trigger the mousemove event.

HTML

<p>Move your mouse to see its position.</p>
<p id="screen-log"></p>

JavaScript

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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
clientY
1
12
1.5
9
≤12.1
1
≤37
18
4
≤12.1
1
1.0

See also

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientY