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diff --git a/testing/web-platform/tests/storage/partitioned-estimate-usage-details-indexeddb.tentative.https.sub.html b/testing/web-platform/tests/storage/partitioned-estimate-usage-details-indexeddb.tentative.https.sub.html
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+++ b/testing/web-platform/tests/storage/partitioned-estimate-usage-details-indexeddb.tentative.https.sub.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html>
+<meta name=help href="https://privacycg.github.io/storage-partitioning/">
+<title>Partitioned estimate() usage details for indexeddb test</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="./helpers.js"></script>
+<script src="../IndexedDB/resources/support-promises.js"></script>
+
+<body>
+  <script>
+    const usageDetails = async () =>
+      (await navigator.storage.estimate()).usageDetails.indexedDB || 0;
+
+    const createSomeUsage = async (test) => {
+      // We use 100KB here because db compaction usually happens every few MB
+      // 100KB is large enough to avoid a false positive (small amounts of
+      // metadata getting written for some random reason), and small enough to
+      // avoid compaction with a reasonably high probability.
+      const write_size = 1024 * 100;
+      const object_store_name = token();
+      const db_name = self.location.pathname;
+
+      await indexedDB.deleteDatabase(db_name);
+      const db = await createDB(db_name, object_store_name, test);
+      const transaction = db.transaction(object_store_name, 'readwrite');
+      const value_to_store = largeValue(write_size, Math.random() * 255);
+      transaction.objectStore(object_store_name).add(value_to_store, 1);
+
+      await transactionPromise(transaction);
+      return db;
+    }
+
+    const testPath = () => location.pathname.split("/").slice(0, -1).join("/");
+
+    let alt_origin = "https://{{hosts[alt][]}}:{{ports[https][0]}}";
+    let details = {};
+
+    const iframe = document.createElement("iframe");
+    iframe.src = `https://{{host}}:{{ports[https][0]}}${testPath()}/resources` +
+      `/partitioned-estimate-usage-details-indexeddb-helper-frame.html`;
+    document.body.appendChild(iframe);
+
+    async_test(test => {
+      if (location.origin === alt_origin)
+        return;
+
+      let db;
+      test.step(async () => {
+        details.init = await usageDetails();
+        db = await createSomeUsage(test);
+        details.after = await usageDetails();
+        assert_greater_than(details.after, details.init);
+
+        iframe.contentWindow.postMessage("get-details", iframe.origin);
+      });
+
+      window.addEventListener("message", test.step_func(event => {
+        if (event.data.source === "same-site") {
+          details.same_site = event.data;
+
+          const cross_site_window = window
+            .open(`${alt_origin}${location.pathname}`, "", "noopener=false");
+          test.add_cleanup(() => cross_site_window.close());
+        }
+        if (event.data.source === "cross-site") {
+          details.cross_site = event.data;
+
+          // Some cleanup
+          test.step(async () => await db.close());
+
+          test.step(() => {
+            assert_true(details.cross_site.init == 0, "Usage should be 0.");
+            assert_equals(details.same_site.init, details.after);
+          });
+
+          test.done();
+        }
+      }));
+    }, "Partitioned estimate() usage details for indexeddb test.");
+  </script>
+</body>