Modern bot detection mechanism (simplified) which is being used by all modern js challenges to check if running in a vm or automated way.

bot_and_vm_detection.js

                /* This work is part of research and development of the undetected-chromedriver
                // https://github.com/UltrafunkAmsterdam/undetected-chromedriver

		//  in automation controlled browsers, doing the below evaluates c always to 0
                //  while the same on a regular browser causes c to always be non 0, albeight small ( ~ 0.0000497656 ) values, but not 0
                //  
                //    var a = performance.now() / 1000, 
                //    b = performance.now() / 1000 , 
                //    c = b - a;
                //    console.log(c);   
                //
                //    c  will always 0 on automation,vmware,or other virtual isolation. 
		//
		//    The below will loop repeating the test several times until a 0 is found and then break. 
		//    This gives little more confidence.
                */   
                function _1337() {
                        function e(n, t) {
                                return n < 1e-8 ?
                                        t :
                                        n < t ?
                                        e(t - Math.floor(t / n) * n, n) :
                                        n == t ?
                                        n : e(t, n)
                        }
                        for (var n = performance.now() / 1e3,
                                        t = performance.now() / 1e3 - n,
                                        r = 0; r < 10; r++)
                                t = e(t, performance.now() / 1e3 - n);
                        return Math.round(1 / t)
                }
                var _f = 0;
                for (var x = 0; x < 25; x++) {
                        // the first to find 0 found will break the loop and output "automation controlled"
                        if (_1337() == Infinity) {

                                _f = 1;
                                // well, we found one. stop here, we don't need more evidence.
                                break;
                        }
                }
                alert(_f ? 'Using automation' : 'Not using automation');