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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Operators</h1>
<h2>The in Operator</h2>
<p>The in operator returns true if a property is in an object.</p>
<p>Is "PI" a property of Math?</p>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = "PI" in Math;
</script>
</body>
</html>