1 files changed, 23 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_xray_named_element_access.js b/js/xpconnect/tests/unit/test_xray_named_element_access.js
new file mode 100644
index 0000000000..c35bf352a9
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_xray_named_element_access.js
@@ -0,0 +1,23 @@
+// See https://bugzilla.mozilla.org/show_bug.cgi?id=1273251
+"use strict"
+
+ChromeUtils.importESModule("resource://gre/modules/Preferences.sys.mjs");
+
+add_task(async function() {
+  let webnav = Services.appShell.createWindowlessBrowser(false);
+
+  let docShell = webnav.docShell;
+
+  docShell.createAboutBlankContentViewer(null, null);
+
+  let window = webnav.document.defaultView;
+  let unwrapped = Cu.waiveXrays(window);
+
+  window.document.body.innerHTML = '<div id="foo"></div>';
+
+  equal(window.foo, undefined, "Should not have named X-ray property access");
+  equal(typeof unwrapped.foo, "object", "Should always have non-X-ray named property access");
+
+  webnav.close();
+});
+