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<!DOCTYPE html> <html> <body> <p>Click the button to join two strings into one new string.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var str1 = "Hello "; var str2 = "world!"; var res = str1.concat(str2); document.getElementById("demo").innerHTML = res; } </script> </body> </html>