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<!DOCTYPE html> <html> <body onpageshow="myFunction(event)"> <h1>Hello World!</h1> <p><strong>Note:</strong> The onpageshow event and the persisted property is not supported in Internet Explorer 10 and earlier versions.</p> <script> function myFunction(event) { if (event.persisted) { alert("The page was cached by the browser"); } else { alert("The page was NOT cached by the browser"); } } </script> </body> </html>