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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support61 No31 No48 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support6161 No3148 No ?

See also

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

Document Tags and Contributors

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