1 files changed, 32 insertions, 0 deletions
diff --git a/accessible/tests/browser/e10s/browser_caching_domnodeid.js b/accessible/tests/browser/e10s/browser_caching_domnodeid.js
new file mode 100644
index 0000000000..722cc9a970
--- /dev/null
+++ b/accessible/tests/browser/e10s/browser_caching_domnodeid.js
@@ -0,0 +1,32 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Test DOM ID caching on remotes.
+ */
+addAccessibleTask(
+  '<div id="div"></div>',
+  async function (browser, accDoc) {
+    const div = findAccessibleChildByID(accDoc, "div");
+    ok(div, "Got accessible with 'div' ID.");
+
+    let contentPromise = invokeContentTask(browser, [], () => {
+      content.document.getElementById("div").id = "foo";
+    });
+    // We don't await for content task to return because we want to exercise the
+    // untilCacheIs function and demonstrate that it can await for a passing
+    // `is` test.
+    await untilCacheIs(
+      () => div.id,
+      "foo",
+      "ID is correct and updated in cache"
+    );
+
+    // Don't leave test without the content task promise resolved.
+    await contentPromise;
+  },
+  { iframe: true, remoteIframe: true }
+);