and [ ` navigator.xr.requestSession() ` ](/en-US/docs/Web/API/XRSystem/requestSession "navigator.xr.requestSession\(\)") calls will return a [ ` Promise ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) that rejects with a [ ` DOMException ` ](/en-US/docs/Web/API/DOMException) of type ` SecurityError ` . 
  * [ ` devicechange ` ](/en-US/docs/Web/API/XRSystem/devicechange_event "devicechange") events are not fired on the [ ` navigator.xr ` ](/en-US/docs/Web/API/Navigator/xr "navigator.xr") object. 

##  Syntax

http

    
    
    Permissions-Policy: xr-spatial-tracking=<allowlist>;
    

` <allowlist> `

    

A list of origins for which permission is granted to use the feature. See [ `
Permissions-Policy ` > Syntax ](/en-US/docs/Web/HTTP/Headers/Permissions-
Policy#syntax) for more details.

##  Default policy

The default allowlist for ` xr-spatial-tracking ` is ` self ` .

##  Specifications

Specification  
---  
[ WebXR Device API  
#  permissions-policy  ](https://immersive-web.github.io/webxr/#permissions-
policy)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ WebXR Device API ](/en-US/docs/Web/API/WebXR_Device_API)
  * [ ` navigator.xr.requestSession() ` ](/en-US/docs/Web/API/XRSystem/requestSession "navigator.xr.requestSession\(\)") , and [ ` navigator.xr.isSessionSupported() ` ](/en-US/docs/Web/API/XRSystem/isSessionSupported "navigator.xr.isSessionSupported\(\)") and [ ` devicechange ` ](/en-US/docs/Web/API/XRSystem/devicechange_event "devicechange") event on [ ` navigator.xr ` ](/en-US/docs/Web/API/Navigator/xr "navigator.xr")
  * [ ` Permissions-Policy ` ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy) header 
  * [ Permissions Policy ](/en-US/docs/Web/HTTP/Permissions_Policy)

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