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diff --git a/testing/web-platform/tests/IndexedDB/idb-partitioned-persistence.tentative.sub.html b/testing/web-platform/tests/IndexedDB/idb-partitioned-persistence.tentative.sub.html
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index 0000000000..65a0a085e2
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+++ b/testing/web-platform/tests/IndexedDB/idb-partitioned-persistence.tentative.sub.html
@@ -0,0 +1,63 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>IndexedDB: partitioned storage test</title>
+<meta name=help href="https://privacycg.github.io/storage-partitioning/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe id="iframe1"></iframe>
+<iframe id="iframe2"></iframe>
+<body>
+<script>
+// Here's the set-up for this test:
+// Step 1. (window) set up listeners for main window.
+// Step 2. (iframe1 & iframe2) loads and sends "iframe loaded" message.
+// Step 3. (window) receives two "iframe loaded" message and sends "create database" message to iframe1.
+// Step 4. (iframe1) receives "create database", creates database, and sends "database created" message.
+// Step 5. (window) receives "database created" message and sends "check database" message to iframe2.
+// Step 6. (iframe2) receives "check database" message, checks if database exists, sends "database checked" message.
+// Step 7. (window) receives the "database checked" message, asserts database existed, and then exits.
+
+async_test(t => {
+  const iframe1 = document.getElementById("iframe1");
+  const iframe2 = document.getElementById("iframe2");
+  let iframes_loaded = 0;
+
+  // Step 1
+  window.addEventListener("message", t.step_func(e => {
+
+    // Step 3
+    if (e.data.message === "iframe loaded") {
+      iframes_loaded++;
+      if (iframes_loaded === 2) {
+        iframe1.contentWindow.postMessage(
+          {message: "create database"},
+          "*",
+        );
+      }
+    }
+
+    // Step 5
+    if (e.data.message === "database created") {
+      iframe2.contentWindow.postMessage(
+        {message: "check database"},
+        "*",
+      );
+    }
+
+    // Step 7
+    if (e.data.message === "database checked") {
+      t.step(() => {
+        assert_true(
+          e.data.doesDatabaseExist,
+          "The same database should exist in both frames",
+        );
+      });
+      t.done();
+    }
+  }));
+
+  iframe1.src = "http://{{hosts[alt][]}}:{{ports[http][0]}}/IndexedDB/resources/idb-partitioned-persistence-iframe.tentative.html";
+  iframe2.src = "http://{{hosts[alt][]}}:{{ports[http][0]}}/IndexedDB/resources/idb-partitioned-persistence-iframe.tentative.html";
+}, "Persistence test for partitioned IndexedDB");
+</script>
+</body>