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<!DOCTYPE html> <html> <body> <p>Click the button to display the exponential notation of a specified number.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var num = 5.56789; var n = num.toExponential(3); document.getElementById("demo").innerHTML = n; } </script> </body> </html>