index.html

<!DOCTYPE html>
<html lang="en">
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  <script src="./data.js"></script>
  <script src="./script.js"></script>

  <head>
    <meta charset="utf-8" />
    <link href="./style.css" rel="stylesheet" />
    <title>Holidays</title>
    <link href="./icon.png" rel="icon" />
  </head>

  <body>
    <h1 id="countdown"></h1>
    <canvas id="canvas"></canvas>
  </body>
</html>