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+<!DOCTYPE html>
+<meta charset=utf-8>
+<head>
+  <title>Tests for Store for W3C Web Authentication</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="u2futil.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+
+  <h1>Tests for Store for W3C Web Authentication</h1>
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1309284">Mozilla Bug 1309284</a>
+
+  <script class="testbody" type="text/javascript">
+    "use strict";
+
+    add_task(async () => {
+      await addVirtualAuthenticator();
+    });
+
+    isnot(navigator.credentials, undefined, "Credential Management API endpoint must exist");
+    isnot(navigator.credentials.create, undefined, "CredentialManagement create API endpoint must exist");
+    isnot(navigator.credentials.get, undefined, "CredentialManagement get API endpoint must exist");
+    isnot(navigator.credentials.store, undefined, "CredentialManagement store API endpoint must exist");
+
+    function arrivingHereIsBad(aResult) {
+      ok(false, "Bad result! Received a: " + aResult);
+      return Promise.resolve();
+    }
+
+    function expectNotSupportedError(aResult) {
+      ok(aResult.toString().startsWith("NotSupportedError"), "Expecting a NotSupportedError, received: " + aResult);
+      return Promise.resolve();
+    }
+
+    add_task(async function test_store_credential() {
+      let credentialChallenge = new Uint8Array(16);
+      window.crypto.getRandomValues(credentialChallenge);
+
+      let rp = {id: document.domain, name: "none"};
+      let user = {id: new Uint8Array(64), name: "none", displayName: "none"};
+      let params = [ {type: "public-key", alg: "es256"}, {type: "public-key", alg: -7} ]
+
+      let makeCredentialOptions = {
+        rp, user, challenge: credentialChallenge, pubKeyCredParams: params
+      };
+
+      let credential = await navigator.credentials.create({publicKey: makeCredentialOptions})
+        .catch(arrivingHereIsBad);
+
+      await navigator.credentials.store(credential)
+        .then(arrivingHereIsBad)
+        .catch(expectNotSupportedError);
+    });
+  </script>
+
+</body>
+</html>