files/en-us/web/api/navigator/xr/index.md
{{APIRef("WebXR Device API")}}{{SecureContext_Header}}{{SeeCompatTable}}
The read-only xr property
provided by the {{domxref("Navigator")}} interface returns an {{domxref("XRSystem")}} object
which can be used to access the WebXR Device API.
The {{domxref("XRSystem")}} object used to interface with the WebXR Device API in the current context. This can be used to present augmented and/or virtual reality imagery to the user.
Each {{domxref("Window")}} has its own instance of {{domxref("Navigator")}}, which can
be accessed as {{domxref("Window.navigator","window.navigator")}} or as
{{domxref("Window.navigator", "navigator")}}. At the same time, a new
{{domxref("XRSystem")}} instance is also created and attached to
the navigator instance as navigator.xr. If
the xr property exists, you can use it to access the WebXR Device API.
To determine if WebXR is available, you can do something like this:
if ("xr" in window.navigator) {
/* WebXR can be used! */
} else {
/* WebXR isn't available */
}
{{Specifications}}
{{Compat}}