1 files changed, 50 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prerender/restriction-web-locks.https.html b/testing/web-platform/tests/speculation-rules/prerender/restriction-web-locks.https.html
new file mode 100644
index 0000000000..02b328d3a3
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prerender/restriction-web-locks.https.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<title>Access to the Web Locks API is deferred</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());
+
+function RunTest(method, description) {
+  promise_test(async t => {
+    const uid = token();
+    const bc = new PrerenderChannel('test-channel', uid);
+
+    const gotMessage = new Promise(resolve => {
+      bc.addEventListener('message', e => {
+        resolve(e.data);
+      }, {
+        once: true
+      });
+    });
+    const url = `resources/web-locks.html?method=${method}&uid=${uid}`;
+    window.open(url, '_blank', 'noopener');
+
+    const result = await gotMessage;
+    const expected = [
+      {event: `started waiting navigator.locks.${method}`,  prerendering: true},
+      {event: 'prerendering change',                      prerendering: false},
+      {event: `finished waiting navigator.locks.${method}`, prerendering: false},
+    ];
+    assert_equals(result.length, expected.length);
+    for (let i = 0; i < result.length; i++) {
+      assert_equals(result[i].event, expected[i].event, `event[${i}]`);
+      assert_equals(result[i].prerendering, expected[i].prerendering,
+        `prerendering[${i}]`);
+    }
+    bc.close();
+
+    // Send a close signal to PrerenderEventCollector on the prerendered page.
+    new PrerenderChannel('close', uid).postMessage('');
+  }, description);
+}
+
+RunTest(`request`, `navigator.locks.request should be deferred until the prerendered page is activated`);
+RunTest(`query`, `navigator.locks.query should be deferred until the prerendered page is activated`);
+</script>
+</body>