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<!DOCTYPE html> <html> <body> <p onclick="myFunction(event)">Click this paragraph to get the number of milliseconds since midnight of January 1, 1970.</p> <p>Timestamp: <span id="demo"></span></p> <script> function myFunction(event) { var n = event.timeStamp; document.getElementById("demo").innerHTML = n; } </script> </body> </html>