Answers for "how to clear cookies of differnt domain through javascript"

delete cookies by domain javascript

document.cookie = 'my_cookie=; path=/; domain=.example.com; expires=' + new Date(0).toUTCString();

clearing cookie in js

document.cookie.split(";")
  .forEach(function(c) { 
  	document.cookie = c.replace(/^ +/, "").replace(/=.*/, "=;expires=" + new Date().toUTCString() + ";path=/"); });