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<html><body><h2>JavaScript Global Variables</h2><p>If you assign a value to a variable that has not been declared, it will automatically become a GLOBAL variable:</p><p id="demo"></p><script>myFunction();// code here can use carName as a global variabledocument.getElementById("demo").innerHTML = "I can display " + carName;function myFunction() { carName = "Volvo";}</script></body></html>