You must first edit the host file with the following values:
127.0.0.1 firstdomain.gre
127.0.0.1 seconddomain.gre
127.0.0.1 thirddomain.gre
To run this project, you need to run the scripts in different windows of the terminal at the root of the TestCrossCookies directory:
node first.js and node second.js and node third.js.
Then in the browser you need to go to URL: http://firstdomain.gre:8000/welcome and press a button Set state.
While pressing the button through the iFrame, cookies are saved to the domain of seconddomain.gre. After moving to the http://thirddomain.gre:4005/welcome page the cookies are saved on this page using iFrame and postMessage