1 files changed, 3 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prerender/resources/postmessage-to-client-worker.js b/testing/web-platform/tests/speculation-rules/prerender/resources/postmessage-to-client-worker.js
new file mode 100644
index 0000000000..4aff84f336
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prerender/resources/postmessage-to-client-worker.js
@@ -0,0 +1,3 @@
+self.onmessage = e => {
+  e.source.postMessage('postmessage to client');
+};