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<!DOCTYPE html> <html> <head> <title>Title of the Document</title> </head> <body> <iframe src="iframe.html" onload="log('iframe onload')"></iframe> <img src="/uploads/media/default/0001/05/e9f3899d915c17845be51e839d5ba238f0404b07.png" id="img"> <script> log('initial readyState:' + document.readyState); document.addEventListener('readystatechange', () => log('readyState:' + document.readyState)); document.addEventListener('DOMContentLoaded', () => log('DOMContentLoaded')); window.onload = () => log('window onload'); img.onload = () => log('img onload'); </script> </body> </html>