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Welcome to JS Bin
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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
  <meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <input type="text" class="threeChars" /><br/>
  <textarea class="affectMe"></textarea>
</body>
</html>
 
$("textarea.affectMe").on("keyup", function(e){
  switch(e.which)
                {
                    case 123: //open curly bracket
                        this.value += '}';
                        break;
                    case 60: //less than
                        this.value += '>';
                        break;
                    case 40: 
                        this.value += ')';
                        
                }
});
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anonymouspro
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