How to check session in iframe?

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if (window.parent && window.parent.document) {
  var parentSessionCookie = window.parent.document.cookie;
  
  if (parentSessionCookie) {
    console.log('Session cookie found in parent window:', parentSessionCookie);
    // Perform any necessary checks or actions based on the session cookie
  } else {
    console.log('No session cookie found in parent window');
  }
} else {
  console.log('Parent window not found');
}