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<!DOCTYPE html> <html lang="en" dir="ltr"> <head> <meta charset="utf-8"> <script type="text/javascript"> function fn() { let start = Date.now(); while (Date.now() - start < 5000) ; // do nothing setTimeout(fn, 0); } setTimeout(fn, 10); </script> </head> <body> <h1>An unresponsive page</h1> </body> </html>