Cross-domain cookies with JavaScript and iframes

Recently launched an open source script for cross-domain cookies with client-side JS & iframes. Curious on the communities opinion of this approach!

Repo: https://github.com/contently/xdomain-cookies

Blog Post: https://medium.com/building-contently/tracking-people-across-multiple-domains-when-cookies-just-arent-enough-b270cc95beb1