ลองตัวเอง - Bootstrap ref_js_tooltip

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="/lib/bootstrap.min.css">
  <script src="/lib/jquery-1.12.2.min.js"></script>
  <script src="/lib/bootstrap.min.js"></script>
  <style>
  a {
      font-size: 25px;
  }
  </style>
</head>
<body>

<div class="container">
  <h3>Popover Methods</h3>
  <a href="#" data-toggle="tooltip" title="Hooray!">Tooltip Example</a>
  <div>
    <p>Click on the buttons to manually control the tooltip above:</p>
    <button type="button" class="btn btn-primary">Show</button>
    <button type="button" class="btn btn-warning">Hide</button>
    <button type="button" class="btn btn-success">Toggle</button>
    <button type="button" class="btn btn-danger">Destroy</button>
  </div>   
</div>

</body>
</html>