selenium_demo/counter.html at main · tomwhross/selenium_demo · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <title>Counter</title>
        <script>

            document.addEventListener('DOMContentLoaded', () =>  {

                let counter = 0;

                document.querySelector('#increase').onclick = () => {
                    counter++;
                    document.querySelector('h1').innerHTML = counter;
                };

                document.querySelector('#decrease').onclick = () => {
                    counter--;
                    document.querySelector('h1').innerHTML = counter;
                };
            });
        </script>
    </head>
    <body>
        <h1>0</h1>
        <button id="increase">+</button>
        <button id="decrease">-</button>
    </body>
</html>