2 files changed, 50 insertions, 1 deletions
diff --git a/accessible/tests/browser/events/browser.toml b/accessible/tests/browser/events/browser.toml
index 7ec3c3621a..ffbb96cfbb 100644
--- a/accessible/tests/browser/events/browser.toml
+++ b/accessible/tests/browser/events/browser.toml
@@ -4,12 +4,13 @@ support-files = [
   "head.js",
   "!/accessible/tests/browser/shared-head.js",
   "!/accessible/tests/mochitest/*.js",
-  "!/accessible/tests/browser/*.jsm",
 ]
 prefs = ["javascript.options.asyncstack_capture_debuggee_only=false"]
 
 ["browser_alert.js"]
 
+["browser_content_prompt.js"]
+
 ["browser_test_A11yUtils_announce.js"]
 
 ["browser_test_caret_move_granularity.js"]
diff --git a/accessible/tests/browser/events/browser_content_prompt.js b/accessible/tests/browser/events/browser_content_prompt.js
new file mode 100644
index 0000000000..7677c0258a
--- /dev/null
+++ b/accessible/tests/browser/events/browser_content_prompt.js
@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Want to test relations.
+/* import-globals-from ../../mochitest/name.js */
+/* import-globals-from ../../mochitest/relations.js */
+/* import-globals-from ../../mochitest/role.js */
+loadScripts(
+  { name: "relations.js", dir: MOCHITESTS_DIR },
+  { name: "name.js", dir: MOCHITESTS_DIR },
+  { name: "role.js", dir: MOCHITESTS_DIR }
+);
+
+addAccessibleTask(``, async function (browser) {
+  info("Showing alert");
+  let shown = waitForEvent(
+    EVENT_SHOW,
+    evt => evt.accessible.role == ROLE_INTERNAL_FRAME
+  );
+  // Let's make sure the dialog content gets focus.
+  // On macOS, we unfortunately focus the label. We focus the OK button on
+  // all other platforms. See https://phabricator.services.mozilla.com/D204908
+  // for more discussion.
+  let expectedRole =
+    AppConstants.platform == "macosx" ? ROLE_LABEL : ROLE_PUSHBUTTON;
+  let focused = waitForEvent(EVENT_FOCUS, evt => {
+    return evt.accessible.role == expectedRole;
+  });
+  await invokeContentTask(browser, [], () => {
+    // Use setTimeout to avoid blocking the return of the content task
+    // on the alert, which is otherwise synchronous.
+    content.setTimeout(() => content.alert("test"), 0);
+  });
+  const frame = (await shown).accessible;
+  const focusedEl = (await focused).accessible;
+  ok(true, "Dialog shown and something got focused");
+  let dialog = getAccessible(focusedEl.DOMNode.ownerDocument);
+  testRole(dialog, ROLE_DIALOG);
+  let infoBody = focusedEl.DOMNode.ownerDocument.getElementById("infoBody");
+  testRelation(dialog, RELATION_DESCRIBED_BY, infoBody);
+  testDescr(dialog, "test ");
+  info("Dismissing alert");
+  let hidden = waitForEvent(EVENT_HIDE, frame);
+  EventUtils.synthesizeKey("KEY_Escape", {}, frame.DOMNode.contentWindow);
+  await hidden;
+});