1 files changed, 54 insertions, 0 deletions
diff --git a/testing/web-platform/tests/focus/activeelement-after-focusing-different-site-iframe-then-immediately-focusing-back.html b/testing/web-platform/tests/focus/activeelement-after-focusing-different-site-iframe-then-immediately-focusing-back.html
new file mode 100644
index 0000000000..b2385705bc
--- /dev/null
+++ b/testing/web-platform/tests/focus/activeelement-after-focusing-different-site-iframe-then-immediately-focusing-back.html
@@ -0,0 +1,54 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>activeElement when focusing different-site iframe then immediately focusing back</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+function waitForEvent(target, event, checkFn) {
+  return new Promise(resolve => {
+    target.addEventListener(event, e => {
+      if (checkFn && !checkFn(e)) {
+        return;
+      }
+      resolve();
+    }, { once: true });
+  });
+}
+
+// This will send message to outer frame and also inner frame to ask them
+// send the log they collect back, the logs of outer and inner will be
+// concatenated.
+async function getLog(w) {
+  let log = "";
+  step_timeout(function() {
+    w.postMessage("getlog", "*");
+  }, 0);
+  await waitForEvent(window, "message", (e) => {
+    log = e.data;
+    return true;
+  });
+  return log;
+}
+
+// This will send message to outer frame to ask it's activeElement.
+async function getActiveElement(w) {
+  let activeElement = "";
+  step_timeout(function() {
+    w.postMessage("getActiveElement", "*");
+  }, 0);
+  await waitForEvent(window, "message", (e) => {
+    activeElement = e.data;
+    return true;
+  });
+  return activeElement;
+}
+
+promise_test(async t => {
+  let w = window.open("support/activeelement-after-focusing-different-site-iframe-then-immediately-focusing-back-outer.sub.html");
+  t.add_cleanup(() => { w.close(); });
+  await waitForEvent(window, "message", e => e.data === "ready");
+  w.postMessage("focus", "*");
+  assert_equals(await getLog(w), 'outerlog:willfocusiframe,didfocusiframe,willfocusinput,inputfocus,didfocusinput,innerlog:windowfocus,windowblur,');
+  assert_equals(await getActiveElement(w), 'INPUT');
+}, "Check focus event and active element after focusing different site iframe then immediately focusing back");
+</script>