<input type="text" id="input">
<script>
    const testCtapPinInvalidErrorBase64 = "MQ==";
    const testCtapInvalidParameterErrorBase64 = "Ag==";
    if (window.internals) {
        internals.setMockWebAuthenticationConfiguration({ hid: { supportClientPin: true, payloadBase64: [testCtapPinInvalidErrorBase64, testCtapInvalidParameterErrorBase64] } });
        internals.withUserGesture(() => { input.focus(); });
    }

    const options = {
        publicKey: {
            rp: {
                name: "localhost",
            },
            user: {
                name: "John Appleseed",
                id: new Uint8Array(16),
                displayName: "Appleseed",
            },
            challenge: new Uint8Array(16),
            pubKeyCredParams: [{ type: "public-key", alg: -7 }]
        }
    };

    navigator.credentials.create(options).then(credential => {
        // console.log("Succeeded!");
        window.webkit.messageHandlers.testHandler.postMessage("Succeeded!");
    }, error => {
        // console.log(error.message);
        window.webkit.messageHandlers.testHandler.postMessage(error.message);
    });
</script>