1 files changed, 12 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/private-network-access/resources/open-to-existing-window.html b/testing/web-platform/tests/fetch/private-network-access/resources/open-to-existing-window.html
new file mode 100644
index 0000000000..6460024bc8
--- /dev/null
+++ b/testing/web-platform/tests/fetch/private-network-access/resources/open-to-existing-window.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Opener to an existing window</title>
+<body></body>
+<script>
+  window.onmessage = (event) => {
+    window.onmessage = (event) => parent.postMessage(event.data, "*");
+    const { url, token } = event.data;
+    window.open('', token);
+    window.open(url, token);
+  };
+</script>