Prerender: Upstream a test for cookies in same-origin prerendered pages

This CL upstreams a test for cookies in same-origin prerendered pages to the WPT. The behavior of cookies is not defined in the spec yet, but we already reached a consensus that the storage APIs including cookies in same-origin prerendered pages are just allowed. See the GitHub issue for details: WICG/nav-speculation#7 (comment) Bug: 1253158 Change-Id: I512a8e6b6f8a20f5464045900d67f8b2ef752266 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3232796 Reviewed-by: Lingqi Chi <lingqi@chromium.org> Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org> Cr-Commit-Position: refs/heads/main@{#933299}
web-platform-tests · Oct 20, 2021 · aea6e4f · aea6e4f
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diff --git a/speculation-rules/prerender/cookies.html b/speculation-rules/prerender/cookies.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<title>Same-origin prerendering can access cookies</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/utils.js"></script>
+<body>
+<script>
+
+setup(() => assertSpeculationRulesIsSupported());
+
+promise_test(async t => {
+  const bc = new BroadcastChannel('prerender-channel');
+
+  const gotMessage = new Promise(resolve => {
+    bc.addEventListener('message', e => {
+      resolve(e.data);
+    }, {
+      once: true
+    });
+  });
+
+  const initiator_cookie = 'initiator_cookie=exist';
+  const prerender_cookie = 'prerender_cookie=exist';
+
+  document.cookie = initiator_cookie;
+
+  // Start prerendering a page that attempts to access cookies.
+  startPrerendering(`resources/cookies-access.html`);
+  const result = await gotMessage;
+  assert_equals(
+    result, initiator_cookie,
+    'prerendering page should be able to read from document cookies.');
+  assert_equals(
+    document.cookie, initiator_cookie + '; ' + prerender_cookie,
+    'prerendering page should be able to write to document cookies');
+}, 'prerendering page should be able to access cookies');
+
+</script>
+</body>
diff --git a/speculation-rules/prerender/resources/cookies-access.html b/speculation-rules/prerender/resources/cookies-access.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+const bc = new BroadcastChannel('prerender-channel');
+assert_true(document.prerendering);
+
+const result = document.cookie;
+document.cookie = "prerender_cookie=exist;path=/;";
+
+bc.postMessage(result);
+bc.close();
+
+</script>