W3School TIY Editor
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<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var x = []; document.getElementById("demo").innerHTML = (5 + null) + "<br>" + ("5" + null) + "<br>" + ("5" + 2) + "<br>" + ("5" - 2) + "<br>" + ("5" * "2") + "<br>" + ("5" / "2") + "<br>" </script> </body> </html>