popup.html

<!DOCTYPE html>
<html>
<head>
  <title>Shaman Build Notifier</title>
  <script src="https://code.jquery.com/jquery-3.3.1.js"></script>
  <script src="popup.js"></script>
  <link rel="stylesheet" type="text/css" href="popup.css" />
</head>
<body>
  <h1>Shaman Build Notifier</h1>
  <form>
    <input type="text" id="branchName" placeholder="Branch Name">
    <input type="text" id="sha1" placeholder="sha1">
    <input type="button" id="addBranch" value="Add Branch">
  </form>
  <table>
    <thead>
        <tr>
          <th>Select</th>
          <th>Branch</th>
          <th>Sha1</th>
          <th>Total</th>
          <th>Succeeded</th>
          <th>Failed</th>
        </tr>
    </thead>
    <tbody id="overviewTbl">
    </tbody>
  </table>
  <input type="button" id="deleteBranch" value="Delete Branch">
</body>
</html>