CS50-Web-Programming-with-Python-and-JavaScript/lecture5/counter2.html at master · dthinkcs/CS50-Web-Programming-with-Python-and-JavaScript · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <script>

            document.addEventListener('DOMContentLoaded', function() {
                document.querySelector('button').onclick = count;
            });

            let counter = 0;

            function count() {
                counter++;
                document.querySelector('#counter').innerHTML = counter;

                if (counter % 10 === 0) {
                    alert(`Counter is at ${counter}!`);
                }
            }

        </script>
        <title>My Website</title>
    </head>
    <body>
        <h1 id="counter">0</h1>
        <button>Click Here!</button>
    </body>
</html>