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This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.

This API is available on Firefox OS for certified applications only.


The zoomRatios property is an Array of numbers representing all the supported zoom ratios. If the camera has no zoom capabilities, the value is null.


var zooms = instanceOfCameraControl.capabilities.zoomRatios


Return an Array of numbers, or null if the camera has no zoom capabilities.


var options = {
  camera: navigator.mozCameras.getListOfCameras()[0]
function onSuccess(camera) {
  var zooms = camera.capabilities.zoomRatios;

  if (Array.isArray(zooms)) {
    zooms.forEach(function (value) {

navigator.mozCameras.getCamera(options, onSuccess)


Not part of any specification; however, this API should be removed when the WebRTC Capture and Stream API has been implemented.

See also

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Contributors to this page: Sheppy, kscarfone, ajaybhat, Jeremie
Last updated by: ajaybhat,