Yubikey sample

var publicKeyCredentialCreationOptions = {
    challenge: Uint8Array.from(
        "randomStringFromServer", c => c.charCodeAt(0)),
    rp: {
        name: "dev",
        id: "developers.yubico.com",
    },
    user: {
        id: Uint8Array.from(
            "UZSL85T9AFC", c => c.charCodeAt(0)),
        name: "lee@webauthn.guide",
        displayName: "Lee",
    },
    pubKeyCredParams: [{alg: -7, type: "public-key"}],
    authenticatorSelection: {
        authenticatorAttachment: "cross-platform",
    },
    timeout: 60000,
    attestation: "direct"
};

navigator.credentials.create({
    publicKey: publicKeyCredentialCreationOptions
}).then(console.log);