Object.defineProperty(navigator, 'webdriver', {get: () => undefined});
Object.defineProperty(navigator, 'platform', {
    get: () => {
        return "iPhone";
    }, set: (a) => {
    }
});

() => {Object.defineProperty(navigator, 'platform', {
    get: () => {
        return "iPhone";
    }
})}

navigator.__defineGetter__('platform', function(){
    return 'iPhone' // customized user agent
});

() => {Object.defineProperty(navigator, 'platform', {
    get: () => {
        return "iPhone";
    }
})}