<input type="text" id="input">
<script>
    if (window.internals) {
        internals.setMockWebAuthenticationConfiguration({ local: { acceptAuthentication: false, acceptAttestation: false } });
        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: -35 }, { type: "public-key", alg: -257 }], // ES384, RS256
            timeout: 100,
        }
    };

    navigator.credentials.create(options);
</script>