diff --git a/components/script/dom/xrinputsourcearray.rs b/components/script/dom/xrinputsourcearray.rs
index d0d4a747052b..bf63e38e073b 100644
--- a/components/script/dom/xrinputsourcearray.rs
+++ b/components/script/dom/xrinputsourcearray.rs
@@ -2,21 +2,26 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+use crate::dom::bindings::cell::DomRefCell;
 use crate::dom::bindings::codegen::Bindings::XRInputSourceArrayBinding;
-use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
-use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
+use crate::dom::bindings::root::{Dom, DomRoot};
 use crate::dom::globalscope::GlobalScope;
+use crate::dom::xrinputsource::XRInputSource;
+use crate::dom::xrsession::XRSession;
 use dom_struct::dom_struct;
 
 #[dom_struct]
 pub struct XRInputSourceArray {
     reflector_: Reflector,
+    input_sources: DomRefCell<Vec<Dom<XRInputSource>>>,
 }
 
 impl XRInputSourceArray {
     fn new_inherited() -> XRInputSourceArray {
         XRInputSourceArray {
             reflector_: Reflector::new(),
+            input_sources: DomRefCell::new(vec![]),
         }
     }
 
@@ -27,4 +32,17 @@ impl XRInputSourceArray {
             XRInputSourceArrayBinding::Wrap,
         )
     }
+
+    pub fn set_initial_inputs(&self, session: &XRSession) {
+        let mut input_sources = self.input_sources.borrow_mut();
+        let global = self.global();
+        session.with_session(|sess| {
+            for info in sess.initial_inputs() {
+                // XXXManishearth we should be able to listen for updates
+                // to the input sources
+                let input = XRInputSource::new(&global, &session, *info);
+                input_sources.push(Dom::from_ref(&input));
+            }
+        });
+    }
 }