1 files changed, 28 insertions, 0 deletions
diff --git a/accessible/tests/browser/e10s/browser_treeupdate_canvas.js b/accessible/tests/browser/e10s/browser_treeupdate_canvas.js
new file mode 100644
index 0000000000..ad7338f725
--- /dev/null
+++ b/accessible/tests/browser/e10s/browser_treeupdate_canvas.js
@@ -0,0 +1,28 @@
+/* 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";
+
+/* import-globals-from ../../mochitest/role.js */
+loadScripts({ name: "role.js", dir: MOCHITESTS_DIR });
+
+addAccessibleTask(
+  `
+  <canvas id="canvas">
+    <div id="dialog" role="dialog" style="display: none;"></div>
+  </canvas>`,
+  async function (browser, accDoc) {
+    let canvas = findAccessibleChildByID(accDoc, "canvas");
+    let dialog = findAccessibleChildByID(accDoc, "dialog");
+
+    testAccessibleTree(canvas, { CANVAS: [] });
+
+    let onShow = waitForEvent(EVENT_SHOW, "dialog");
+    await invokeSetStyle(browser, "dialog", "display", "block");
+    await onShow;
+
+    testAccessibleTree(dialog, { DIALOG: [] });
+  },
+  { iframe: true, remoteIframe: true }
+);