The DOMPointReadOnly interface's z property holds the depth coordinate, z, for a read-only point in space. If your script needs to be able to change the value of this property, you should instead use the DOMPoint object.

In general, positive values of z mean toward the user (out from the screen), and negative values of z mean away from the user (into the screen), assuming no transforms have resulted in a reversal.


var zPos = DOMPointReadOnly.z;


A double-precision floating-point value indicating the z coordinate's value for the point. This value is unrestricted, meaning that it is allowed to be infinite or invalid (that is, its value may be NaN or ±Infinity).


Specification Status Comment
Geometry Interfaces Module Level 1
The definition of 'z' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 61Edge No support NoFirefox Full support 31IE No support NoOpera Full support 48Safari No support NoWebView Android Full support 61Chrome Android Full support 61Edge Mobile No support NoFirefox Android Full support 31Opera Android Full support 48Safari iOS No support NoSamsung Internet Android ?


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

  • The other coordinate properties: x, y, and the perspective value, w.

Document Tags and Contributors

Contributors to this page: sideshowbarker, Sheppy, rolfedh, chrisdavidmills
Last updated by: sideshowbarker,