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<!DOCTYPE html> <html> <body> <h1>JavaScript Numbers</h1> <h2>The isNaN() Method</h2> <p>The isNan() method returns true if the argument is NaN. Otherwise it returns false.</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = isNaN("Hello") + "<br>" + isNaN("10"); </script> </body> </html>
