1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prerender/restriction-idle-detection.https.html b/testing/web-platform/tests/speculation-rules/prerender/restriction-idle-detection.https.html
new file mode 100644
index 0000000000..688ae00ba7
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prerender/restriction-idle-detection.https.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>Prerendering cannot invoke the Idle Detection API</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);
+
+  const gotMessage = new Promise(resolve => {
+    bc.addEventListener('message', e => {
+      resolve(e.data);
+    }, {
+      once: true
+    });
+  });
+
+  // Start prerendering a page that attempts to invoke the Idle Detection API.
+  // This API is activation-gated so it's expected to fail:
+  // https://wicg.github.io/nav-speculation/prerendering.html#activation-gated
+  startPrerendering(`resources/idle-detection.https.html?uid=${uid}`);
+  const result = await gotMessage;
+  assert_equals(result, 'NotAllowedError');
+  bc.close();
+}, `prerendering pages should not be able to invoke the Idle Detection API`);
+
+</script>
+</body>