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<!DOCTYPE html> <html> <body> <h1>JavaScript Closures</h1> <p>Counting with a function variable.</p> <p id="demo"></p> <script> // Function to increment counter function add() { let counter = 0; counter += 1; return counter; } let x = 0; // Call add() 3 times x = add(); x = add(); x = add(); // The counter should now be 3. But it is 1. document.getElementById("demo").innerHTML = "The counter is: " + x; </script> </body> </html>