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<!DOCTYPE html> <html> <body> <p>Integers are considered accurate up to 15 digits.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = 999999999999999; var y = 9999999999999999; document.getElementById("demo").innerHTML = x + "<br>" + y; } </script> </body> </html>