Using JS or CSS view text link ( CMS Use Rocket Loader to filter some JS )

I use a platform with no access to html, Only CSS and Js.

So how can I use JS to to identify a css class and view a hyper link with text.
(( There's a trick!! They use Rocket Loader to cleanse some JS codes. Need to bypass it ))


I tried these codes. But don't work!

var container = document.querySelector('.footer_bottom .container');

var link = document.createElement('a');
link.href = 'https://google.com/';
link.textContent = 'Google Search';

container.appendChild(link);


-----

var container = document.querySelector('.footer_bottom .container');
container.innerHTML = '<a href="https://google.com/">Google Search</a>';

Errors added in attachment