1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prerender/restriction-prompt-by-before-unload.html b/testing/web-platform/tests/speculation-rules/prerender/restriction-prompt-by-before-unload.html
new file mode 100644
index 0000000000..16ebe4f39b
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prerender/restriction-prompt-by-before-unload.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>Prerendering cannot invoke the prompt generated by the
+       beforeunload event</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/speculation-rules/prerender/resources/utils.js"></script>
+<body>
+<script>
+setup(() => assertSpeculationRulesIsSupported());
+
+promise_test(async t => {
+  const uid = token();
+  const bc = new PrerenderChannel('prerender-channel', uid);
+  t.add_cleanup(_ => bc.close());
+
+  const gotMessage = new Promise(resolve => {
+    bc.addEventListener('message', e => {
+      resolve(e.data);
+    }, {
+      once: true
+    });
+  });
+  // Start prerendering a page that attempts to invoke
+  // the prompt generated by the beforeunload event.
+  // It is activation-gated and expects to fail.
+  startPrerendering(`resources/prompt-by-before-unload.html?uid=${uid}`);
+
+  const result = await gotMessage;
+  assert_equals(result,
+                'unloaded without the prompt by beforeunload.');
+}, 'Prerendering cannot invoke the prompt by the beforeunload event.');
+</script>
+</body>