index.html

<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <link rel="stylesheet" href="style.css" type="text/css" media="all" />
    <script
      src="script.js"
      type="text/javascript"
      charset="utf-8"
      defer
    ></script>
    <title>WorkbenchJS</title>
  </head>
  <body>
    <div id="workbench">
      <div id="inPanel" class="panel">
        Input
        <button id="run">Run (ctrl + ↲)</button><br />
        <div id="input">
          <textarea></textarea>
        </div>
      </div>
      <div id="outPanel" class="panel">
        Console
        <button id="clear">Clear</button><br />
        <pre id="output"></pre>
      </div>
    </div>
  </body>
</html>