What are the limitations of modifying an iFrame's content if it is on a different domain?

When trying to modify an iFrame's content that is on a different domain, the browser's same-origin policy restricts access to the iFrame's content for security reasons. This means that you cannot directly manipulate the iFrame's content using JavaScript or other client-side technologies. One way to work around this limitation is to use a server-side proxy script to fetch the content from the iFrame's domain and then display it on your own domain. 

<?php
$iframe_url = 'https://www.example.com/iframe-page.html';
$iframe_content = file_get_contents($iframe_url);
echo $iframe_content;
?>

Keywords

Cross-origin Same-origin policy CORS Content security policy JavaScript sandbox

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