1 files changed, 17 insertions, 0 deletions
diff --git a/testing/web-platform/tests/performance-timeline/resources/postmessage-entry.html b/testing/web-platform/tests/performance-timeline/resources/postmessage-entry.html
new file mode 100644
index 0000000000..ef5be73395
--- /dev/null
+++ b/testing/web-platform/tests/performance-timeline/resources/postmessage-entry.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<script>
+addEventListener("load", () => {
+  const entry = performance.getEntriesByType("navigation")[0];
+  try {
+    window.top.postMessage(entry, "*");
+  } catch(error) {
+    if (error.name == "DataCloneError") {
+      window.top.postMessage("PASS", "*");
+    } else {
+      window.top.postMessage("FAIL - Wrong exception name: " + error.name, "*");
+    }
+  }
+  window.top.postMessage("FAIL - No exception thrown", "*");
+});
+
+</script>