MDN wants to talk to developers like you: https://qsurvey.mozilla.com/s3/a3e7b5301fea

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The VRFieldOfView interface of the WebVR API represents a field of view defined by 4 different degree values describing the view from a center point.

Properties

VRFieldOfView.upDegrees Read only
The number of degrees upwards that the field of view extends in.
VRFieldOfView.rightDegrees Read only
The number of degrees to the right that the field of view extends in.
VRFieldOfView.downDegrees Read only
The number of degrees downwards that the field of view extends in.
VRFieldOfView.leftDegrees Read only
The number of degrees to the left that the field of view extends in.

Examples

var info = document.querySelector('p');
var list = document.querySelector('ul');
var vrDisplay;

if(navigator.getVRDisplays) {
    reportFieldOfView();
} else {
  info.textContent = 'WebVR API not supported by this browser.'
}

function reportFieldOfView() {
  navigator.getVRDisplays().then(function(displays) {
    vrDisplay = displays[0];
    var lEye = vrDisplay.getEyeParameters('left');
    var rEye = vrDisplay.getEyeParameters('right');
    // lEye and rEye are VREyeParameters objects

    var lFOV = lEye.fieldOfView;
    var rFOV = rEye.fieldOfView;
    // lFOV and rFOV are VRFieldOfView objects

    var listitem1 = document.createElement('li');
    var listitem2 = document.createElement('li');

    listitem1.innerHTML = '<strong>Left eye parameters</strong>'
                 + '<br>Offset: ' + lEye.offset
                 + '<br>Render width: ' + lEye.renderWidth
                 + '<br>Render height: ' + lEye.renderHeight
                 + '<br>Up degrees: ' + lFOV.upDegrees
                 + '<br>Right degrees: ' + lFOV.rightDegrees
                 + '<br>Down degrees: ' + lFOV.downDegrees
                 + '<br>Left degrees: ' + lFOV.leftDegrees

   listitem2.innerHTML = '<strong>Right eye parameters</strong>'
                + '<br>Offset: ' + rEye.offset
                + '<br>Render width: ' + rEye.renderWidth
                + '<br>Render height: ' + rEye.renderHeight
                + '<br>Up degrees: ' + rFOV.upDegrees
                + '<br>Right degrees: ' + rFOV.rightDegrees
                + '<br>Down degrees: ' + rFOV.downDegrees
                + '<br>Left degrees: ' + rFOV.leftDegrees

    list.appendChild(listitem1);
    list.appendChild(listitem2);
  });
}

Specifications

Specification Status Comment
WebVR 1.1
The definition of 'VRFieldOfView' in that specification.
Editor's Draft Initial definition

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support No support[1] (Yes) 55 (55)[2] No support No support No support
Feature Android Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android Samsung Internet for GearVR
Basic support No support No support 55.0 (55) No support No support No support (Yes)[3] (Yes)
 

[1] API Available on all platforms behind a flag, but currently only works on desktop in an experimental version of Chrome (other builds won't return any devices when Navigator.getVRDisplays() is invoked).

[2] Currently only Windows support is enabled by default. Mac support is available in Firefox Nightly.

[3] Currently supported only by Google Daydream.

See also

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, Sebastianz
 Last updated by: chrisdavidmills,