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<!DOCTYPE html> <html> <body> <p>The value of a variable with no value is <b>undefined</b>.</p> <p>Variables can be emptied by setting the value to <b>null</b>.</p> <p id="demo"></p> <script> var person; var car = "Volvo"; var x = null; document.getElementById("demo").innerHTML = person + "<br>" + car + "<br>" + x; </script> </body> </html>
