MouseEvent: clientX property

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

<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

See also

• MouseEvent
• clientY
• screenX / screenY
• Coordinate systems