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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>
