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<html><body><h1>JavaScript Operators</h1><h2>The typeof Operator</h2><p>Undefined and null are equal in value but different in type:</p><p id="demo"></p><script>document.getElementById("demo").innerHTML ="<p>The typeof undefined is " + typeof undefined +"<p>The typeof null is " + typeof null +"<p>(null === undefined) is " + (null === undefined) +"<p>(null == undefined) is " + (null == undefined);</script></body></html>