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<!DOCTYPE html> <html> <body> <p>Click "Try it" to display all my children:</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var myGirls = ["Cecilie", "Lone"]; var myBoys = ["Emil", "Tobias", "Linus"]; var myChildren = myGirls.concat(myBoys); document.getElementById("demo").innerHTML = myChildren; } </script> </body> </html>