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Iframe
Displaying a web page using the HTML <iframe> tag without changing the link in the browser's address bar. Keep in mind that some websites may prohibit the display of their content in an iframe using the X-Frame-Options response header, which may cause this action not to work.
Contrary to common belief, iframes are often considered as redirects by advertising networks because the process of loading the frame results in a visible and easily trackable HTTP request. This action is not as secure as it may seem. It is recommended to use displaying a local file or proxying instead.