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diff --git a/testing/web-platform/tests/webauthn/createcredential-extensions.https.html b/testing/web-platform/tests/webauthn/createcredential-extensions.https.html
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+++ b/testing/web-platform/tests/webauthn/createcredential-extensions.https.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>WebAuthn navigator.credentials.create() extensions Tests</title>
+<meta name="timeout" content="long">
+<link rel="author" title="Adam Powers" href="mailto:adam@fidoalliance.org">
+<link rel="help" href="https://w3c.github.io/webauthn/#iface-credential">
+<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>
+<body></body>
+<script>
+standardSetup(function() {
+    "use strict";
+
+    var dummyExtension = {
+        foo: true,
+        bar: "yup"
+    };
+
+    // bad extension values
+    new CreateCredentialsTest("options.publicKey.extensions", "hi mom").runTest("Bad extensions: extensions is string", TypeError);
+
+    // phony extensions
+    var randomExtId = {};
+    randomExtId[createRandomString(64)] = dummyExtension;
+    new CreateCredentialsTest("options.publicKey.extensions", {foo: JSON.stringify(randomExtId)}).runTest("extensions is a nonsensical JSON string");
+
+    // appid
+    new CreateCredentialsTest("options.publicKey.extensions", {appid: ""}).runTest("empty appid in create request", "NotSupportedError");
+    new CreateCredentialsTest("options.publicKey.extensions", {appid: null}).runTest("null appid in create request", "NotSupportedError");
+    new CreateCredentialsTest("options.publicKey.extensions", {appid: "anything"}).runTest("appid in create request", "NotSupportedError");
+});
+
+/* JSHINT */
+/* globals standardSetup, CreateCredentialsTest, createRandomString */
+</script>