The DOMPointReadOnly() constructor returns a new DOMPointReadOnly object representing a point in 2D or 3D space, optionally with perspective, whose values cannot be altered by script code.


point = new DOMPointReadOnly(x, y, z, w);


x Optional
The value of the horizontal coordinate, x, as a floating point number. The default value is 0.
y Optional
The value of the vertical coordinate, y, as a floating point number. The default value is 0.
z Optional
The value of the depth coordinate, z, as a floating point number. The default value is 0.
w Optional
The value of the perspective, w, as a floating point number. The default is 1.

Note: Each of these values is what's called an unrestricted number. In addition to any finite floating-point value, you may use special values such as ±Infinity and NaN.

Return value

A new DOMPointReadOnly object representing the specified location in space.


The following code demonstrates creating both 2D and 3D points.

var point2D = new DOMPointReadOnly(50, 25);
var point3D = new DOMPointReadOnly(50, 0, 10);
var perspectivePoint3D = new DOMPointReadOnly(50, 50, 25, 0.5);


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

Browser compatibility

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ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
DOMPointReadOnly() constructorChrome Full support 61Edge Full support 79Firefox Full support 62IE No support NoOpera Full support 48Safari Full support 10.1WebView Android Full support 61Chrome Android Full support 61Firefox Android Full support 62Opera Android Full support 45Safari iOS Full support 10.3Samsung Internet Android Full support 8.0


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