How to addclass to a body tag inside a generated iframe?

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// Get the iframe element
var iframe = document.getElementById('your-iframe-id');

// Check if the iframe has loaded
iframe.onload = function() {
   // Get the iframe's document object
   var iframeDocument = iframe.contentDocument || iframe.contentWindow.document;
   
   // Get the body element inside the iframe
   var body = iframeDocument.querySelector('body');
   
   // Add a class to the body element
   body.classList.add('your-class-name');
};