I am attempting to use Google Sign-In for Websites (https://developers.google.com/identity/sign-in/web/) and noticed that my solution is not working in Internet Explorer 11.
I ran into the same problem now, a few months later.
If you look at:
https://developers.google.com/identity/sign-in/web/build-button
and try a signin with their demo button, it does not work with IE11 (but it works with other browsers I am using at different OS). I could not find any solution.
I am leaving the comment for a future reader, who searches for the same problem in the future. If the demo button at Google does not work, she can at least rest assured that the problem is probably not in her code. :)