1 files changed, 45 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/cross-origin-opener-policy/resources/postback.html b/testing/web-platform/tests/html/cross-origin-opener-policy/resources/postback.html
new file mode 100644
index 0000000000..35b3be5c93
--- /dev/null
+++ b/testing/web-platform/tests/html/cross-origin-opener-policy/resources/postback.html
@@ -0,0 +1,45 @@
+<!doctype html>
+<meta charset=utf-8>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script>
+const params = new URL(location).searchParams;
+const channelName = params.get("channel");
+const responseToken = params.get("responseToken");
+const iframeToken = params.get("iframeToken");
+
+// If the channel parameter is set, use the BroadcastChannel-based communication
+// method. Otherwise, use the dispatcher (useful in cases where this is embedded
+// in a third-party iframe that doesn't share a partition with the top-level
+// site).
+if (channelName != "null") {
+  const bc = new BroadcastChannel(channelName);
+  // Handle the close message from the test-cleanup, forwarding it to the
+  // top level document, as this iframe and the opening document might not
+  // be able to close the popup.
+  bc.onmessage = event => {
+    if (event.data == "close") {
+       top.postMessage("close", "*");
+     }
+  };
+
+  window.addEventListener("message", event => {
+    bc.postMessage(event.data);
+  });
+
+} else {
+  window.addEventListener("message", event => {
+    send(responseToken, JSON.stringify(event.data));
+  });
+
+  async function waitToClose() {
+    response = await receive(iframeToken);
+    // Handle the close message from the test-cleanup, forwarding it to the
+    // top level document, as this iframe and the opening document might not
+    // be able to close the popup.
+    if (response == "close") {
+      top.postMessage("close", "*");
+    }
+  }
+  waitToClose();
+}
+</script>