diff --git a/speculation-rules/prerender/resources/session-storage-carry-over-to-prerender-page.html b/speculation-rules/prerender/resources/session-storage-carry-over-to-prerender-page.html
new file mode 100644
index 00000000000000..39df79c84762fd
--- /dev/null
+++ b/speculation-rules/prerender/resources/session-storage-carry-over-to-prerender-page.html
@@ -0,0 +1,23 @@
+
+
+
+
+
+
diff --git a/speculation-rules/prerender/resources/session-storage-isolated-while-prerendering.html b/speculation-rules/prerender/resources/session-storage-isolated-while-prerendering.html
new file mode 100644
index 00000000000000..46170393deb4ad
--- /dev/null
+++ b/speculation-rules/prerender/resources/session-storage-isolated-while-prerendering.html
@@ -0,0 +1,44 @@
+
+
+
+
+
+
diff --git a/speculation-rules/prerender/resources/session-storage-no-leak-to-initiator-page.html b/speculation-rules/prerender/resources/session-storage-no-leak-to-initiator-page.html
new file mode 100644
index 00000000000000..6c0ee4c4adbab9
--- /dev/null
+++ b/speculation-rules/prerender/resources/session-storage-no-leak-to-initiator-page.html
@@ -0,0 +1,38 @@
+
+
+
+
+
+
diff --git a/speculation-rules/prerender/resources/session-storage-swap-after-activate.html b/speculation-rules/prerender/resources/session-storage-swap-after-activate.html
new file mode 100644
index 00000000000000..c5e443721491a7
--- /dev/null
+++ b/speculation-rules/prerender/resources/session-storage-swap-after-activate.html
@@ -0,0 +1,79 @@
+
+
+
+
+
+
diff --git a/speculation-rules/prerender/resources/session-storage-utils.js b/speculation-rules/prerender/resources/session-storage-utils.js
new file mode 100644
index 00000000000000..06688e3bd4cf6e
--- /dev/null
+++ b/speculation-rules/prerender/resources/session-storage-utils.js
@@ -0,0 +1,72 @@
+function getSessionStorageKeys() {
+ let keys = [];
+ let txt = '';
+ for (let i = 0; i < sessionStorage.length; ++i) {
+ keys.push(sessionStorage.key(i));
+ }
+ keys.sort();
+ keys.forEach((key) => {
+ if (txt.length) {
+ txt += ', ';
+ }
+ txt += key;
+ });
+ return txt;
+}
+
+function getNextMessage(channel) {
+ return new Promise(resolve => {
+ channel.addEventListener('message', e => {
+ resolve(e.data);
+ }, {once: true});
+ });
+}
+
+// session_storage_test() is a utility function for running session storage
+// related tests that open a initiator page using window.open().
+function session_storage_test(testPath, uid) {
+ promise_test(async t => {
+ const testChannel = new PrerenderChannel('test-channel', uid);
+ t.add_cleanup(() => {
+ testChannel.close();
+ });
+ const gotMessage = getNextMessage(testChannel);
+ const url = 'resources/' + testPath + '?uid=' + uid;
+ window.open(url, '_blank', 'noopener');
+ assert_equals(await gotMessage, 'Done');
+ }, testPath);
+}
+
+// RunSessionStorageTest() is a utility function for running session storage
+// related tests that requires coordinated code execution on both the initiator
+// page and the prerendering page. The passed |func| function will be called
+// with the following arguments:
+// - isPrerendering: Whether the |func| is called in the prerendering page.
+// - url: The URL of the prerendering page. |func| should call
+// startPrerendering(url) when |isPrerendering| is false to start the
+// prerendering.
+// - channel: A PrerenderChannel which can be used to coordinate the code
+// execution on the initiator page and the prerendering page.
+// - done: A function that should be called when the test completes
+// successfully.
+async function RunSessionStorageTest(func, uid) {
+ const url = new URL(document.URL);
+ url.searchParams.set('prerendering', '');
+ const params = new URLSearchParams(location.search);
+ // The main test page loads the initiator page, then the initiator page will
+ // prerender itself with the `prerendering` parameter.
+ const isPrerendering = params.has('prerendering');
+ const prerenderChannel = new PrerenderChannel('prerender-channel', uid);
+ const testChannel = new PrerenderChannel('test-channel', uid);
+ window.addEventListener('pagehide', () => {
+ prerenderChannel.close();
+ testChannel.close();
+ });
+ try {
+ await func(isPrerendering, url.toString(), prerenderChannel, () => {
+ testChannel.postMessage('Done');
+ })
+ } catch (e) {
+ testChannel.postMessage(e.toString());
+ }
+}
diff --git a/speculation-rules/prerender/session-storage.tentative.html b/speculation-rules/prerender/session-storage.tentative.html
new file mode 100644
index 00000000000000..92d73285cce8df
--- /dev/null
+++ b/speculation-rules/prerender/session-storage.tentative.html
@@ -0,0 +1,30 @@
+
+
+Same-origin prerendering can access sessionStorage
+
+
+
+
+
+
+
+
+