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diff --git a/testing/web-platform/tests/webauthn/createcredential-getpublickey.https.html b/testing/web-platform/tests/webauthn/createcredential-getpublickey.https.html
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+++ b/testing/web-platform/tests/webauthn/createcredential-getpublickey.https.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>WebAuthn getPublicKey</title>
+<meta name="timeout" content="long">
+<link rel="help" href="https://w3c.github.io/webauthn/#sctn-public-key-easy">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="helpers.js"></script>
+<script src="resources/utils.js"></script>
+<script>
+function testGetPublicKey() {
+    standardSetup(function() {
+        promise_test(async t => {
+            let cred = await createCredential();
+            const response = cred.response;
+            assert_equals(response.getPublicKeyAlgorithm(),
+                          cose_alg_ECDSA_w_SHA256);
+
+            const attestationObject =
+                new Cbor(response.attestationObject).getCBOR();
+            const claimedAuthDataHex = uint8ArrayToHex(
+                new Uint8Array(response.getAuthenticatorData()));
+            const actualAuthDataHex = uint8ArrayToHex(attestationObject.authData);
+            assert_equals(actualAuthDataHex, claimedAuthDataHex);
+
+            // Check that the x and y coordinates of the public key appear in
+            // the claimed SPKI, at least.
+            const spkiHex = uint8ArrayToHex(
+                new Uint8Array(response.getPublicKey()));
+            const authData = parseAuthenticatorData(attestationObject.authData);
+            const pubKey = authData.attestedCredentialData.credentialPublicKey;
+            const xHex = uint8ArrayToHex(pubKey.x);
+            const yHex = uint8ArrayToHex(pubKey.y);
+            assert_not_equals(-1, spkiHex.indexOf(xHex));
+            assert_not_equals(-1, spkiHex.indexOf(yHex));
+
+            t.done();
+        });
+    });
+}
+
+testGetPublicKey();
+/* JSHINT */
+/* globals standardSetup, createCredential */
+</script>
+</head>
+<body></body>
+</html>