How to download a file from iframe in javascript?

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

// Get the document object of the iframe
var iframeDoc = iframe.contentDocument || iframe.contentWindow.document;

// Find the link element inside the iframe
var link = iframeDoc.getElementById('link-to-file-id');

// Create a hidden anchor element
var anchor = document.createElement('a');
anchor.style.display = 'none';
document.body.appendChild(anchor);

// Set the href attribute of the anchor element to the file URL
anchor.href = link.href;

// Trigger a click event on the anchor element to start the download
anchor.click();

// Clean up
document.body.removeChild(anchor);