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<!DOCTYPE html> <html> <body> <p>Click the button to join three arrays.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var arr1 = ["Cecilie", "Lone"]; var arr2 = ["Emil", "Tobias", "Linus"]; var arr3 = ["Robin", "Morgan"]; document.getElementById("demo").innerHTML = arr1.concat(arr2, arr3); } </script> </body> </html>