1 files changed, 18 insertions, 0 deletions
diff --git a/testing/web-platform/tests/browsing-topics/resources/check-topics-request-header-notify-parent.py b/testing/web-platform/tests/browsing-topics/resources/check-topics-request-header-notify-parent.py
new file mode 100644
index 0000000000..98c77c2b0b
--- /dev/null
+++ b/testing/web-platform/tests/browsing-topics/resources/check-topics-request-header-notify-parent.py
@@ -0,0 +1,18 @@
+def main(request, response):
+    """
+    Returns an HTML response that notifies its parent frame the topics header
+    via postMessage
+    """
+
+    topics_header = request.headers.get(b"sec-browsing-topics", b"NO_TOPICS_HEADER")
+
+    headers = [(b"Content-Type", b"text/html"),
+               (b"Access-Control-Allow-Origin", b"*")]
+    content = b'''
+<script>
+  let parentOrOpener = window.opener || window.parent;
+  parentOrOpener.postMessage({ topicsHeader: '%s'}, "*");
+</script>
+''' % (topics_header)
+
+    return 200, headers, content