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diff --git a/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/identity-not-preserved.https.html b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/identity-not-preserved.https.html
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index 0000000000..869f49043e
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+++ b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/identity-not-preserved.https.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>SharedArrayBuffers, when cloned, do not give back the same object</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#structuredserialize">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="resources/test-sab.js"></script>
+
+<div id="log"></div>
+
+<script>
+"use strict";
+
+async_test(t => {
+  const testId = token();
+  const sab = new SharedArrayBuffer(1);
+  window.addEventListener("message", t.step_func(({ data }) => {
+    if (data.testId !== testId) {
+      return;
+    }
+
+    assertSABsHaveSameBackingBlock(sab, data.sab);
+
+    t.done();
+  }));
+
+  window.postMessage({ testId, sab }, "*");
+}, "postMessaging to this window does not give back the same SharedArrayBuffer (but does use the same backing block)");
+
+async_test(t => {
+  const testId = token();
+  const sab = new SharedArrayBuffer();
+  const worker = new Worker("../resources/echo-worker.js");
+
+  worker.addEventListener("message", t.step_func(({ data }) => {
+    if (data.testId !== testId) {
+      return;
+    }
+
+    assert_not_equals(data.sab, sab);
+    t.done();
+  }));
+
+  worker.postMessage({ testId, sab });
+}, "postMessaging to a worker and back does not give back the same SharedArrayBuffer");
+
+async_test(t => {
+  const testId = token();
+  const sab = new SharedArrayBuffer();
+  window.addEventListener("message", t.step_func(({ data }) => {
+    if (data.testId !== testId) {
+      return;
+    }
+
+    assert_not_equals(data.sab, sab);
+    t.done();
+  }));
+
+  const iframe = document.createElement("iframe");
+  iframe.onload = t.step_func(() => {
+    iframe.contentWindow.postMessage({ testId, sab }, "*");
+  });
+  iframe.src = "../resources/echo-iframe.html";
+  document.body.appendChild(iframe);
+}, "postMessaging to an iframe and back does not give back the same SharedArrayBuffer");
+</script>