1 files changed, 10 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/cross-origin-opener-policy/resources/fully-loaded.js b/testing/web-platform/tests/html/cross-origin-opener-policy/resources/fully-loaded.js
new file mode 100644
index 0000000000..d40e00af43
--- /dev/null
+++ b/testing/web-platform/tests/html/cross-origin-opener-policy/resources/fully-loaded.js
@@ -0,0 +1,10 @@
+// Return a promise, which resolves when new navigations aren't considered
+// client-side redirects anymore.
+//
+// Note: A long `setTimeout` is used, because client-side redirect is an
+// heuristic and isn't clearly specified.
+function fullyLoaded() {
+  return new Promise((resolve, reject) => {
+    addEventListener('load', () => setTimeout(resolve, 2000))
+  });
+}