1 files changed, 25 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 000000000..e4b3b70f7
--- /dev/null
+++ b/accessible/tests/browser/e10s/browser_treeupdate_canvas.js
@@ -0,0 +1,25 @@
+/* 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';
+
+/* global EVENT_SHOW */
+
+loadScripts({ name: 'role.js', dir: MOCHITESTS_DIR });
+
+addAccessibleTask(`
+  <canvas id="canvas">
+    <div id="dialog" role="dialog" style="display: none;"></div>
+  </canvas>`, function*(browser, accDoc) {
+  let canvas = findAccessibleChildByID(accDoc, 'canvas');
+  let dialog = findAccessibleChildByID(accDoc, 'dialog');
+
+  testAccessibleTree(canvas, { CANVAS: [] });
+
+  let onShow = waitForEvent(EVENT_SHOW, 'dialog');
+  yield invokeSetStyle(browser, 'dialog', 'display', 'block');
+  yield onShow;
+
+  testAccessibleTree(dialog, { DIALOG: [] });
+});