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my_answer / question_2 / sample_2 / index.html

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<html>
  <head>
    <meta charset="UTF-8">
    <title>inner HTML</title>
  </head>
  <body>
    <div>
      <h1>innerHTML</h1>
      <button id="insert-element">insert 100 element</button>
    </div>
    <hr/>
    <div id="target">
    </div>
    <script type="text/javascript" src="main.js"></script>
  </body>
</html>