Bootstrap使元素不可见

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap Example</title>
      <link href = /bootstrap/css/bootstrap.min.css rel = stylesheet>
      <script src = /scripts/jquery.min.js></script>
      <script src = /bootstrap/js/bootstrap.min.js></script>
   </head>
   <body>
      <div class = container>
         <h2>Cricket Boards</h2>
         <p>The <abbr title = International Cricket Council>ICC</abbr> governs cricket boards.</p>
         <p class = invisible>BCCI is also governed by ICC. (This element is invisible)</p>
      </div>
   </body>
</html>

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