The MouseEvent.movementX read-only property provides the shift in the X coordinate of the mouse pointer between that event and the previous mousemove event. In other words, the value of that property is computed that way : currentEvent.movementX = currentEvent.screenX - previousEvent.screenX.


var xShift = instanceOfMouseEvent.movementX

Return value

A number


Specification Status Comment
Pointer Lock
The definition of 'MouseEvent.movementX' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support

1.0 (1.7 or earlier) moz
41 (41)

22.0 webkit
37.0 unprefixed

No support ? No support
Feature Firefox Mobile (Gecko) Android Android Webview IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support 1.0 (1.0) moz
41.0 (41)
? ? No support ? No support (Yes) webkit
37.0 unprefixed

See also


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

API DOM DOM Events mouse lock MovementX pointer lock Property Read-only Reference