task-04.html

<!DOCTYPE html>
<html lang="ru">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <title>Задание 4</title>
    <style>
      body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
          Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
        background-color: #fff;
        color: #424242;
        line-height: 1.5;
      }
    </style>
  </head>
  <body>
    <p><a href="index.html">На главную</a></p>

    <div id="counter">
      <button type="button" data-action="decrement">-1</button>
      <span id="value">0</span>
      <button type="button" data-action="increment">+1</button>
    </div>

    <script src="js/task-04.js" type="module"></script>
  </body>
</html>