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<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<html>
<head>
  <div id="annyoing:colon">abbbc</div>
  <div id="nocolon">xxxxyyz</div>
  
  
  
​
  
  
  
  <script>
    var oldTime=new Date().getTime();
    
    for(var i=0; i< 10000 ; i++){
      $("#annyoing\\:colon");
    }
   console.error(new Date().getTime() - oldTime + ' $("#annyoing\\\\:colon")');
    $("#annyoing\\:colon").css("background-color", "blue"); //the playing around with the colors is only to test whether the selector actually works
    
    
    
    
    
    
    
    
    oldTime=new Date().getTime();
    for(var i=0; i< 10000 ; i++){
      $("[id='annyoing:colon']");
    }
       
    console.error(new Date().getTime() - oldTime + " $(\"[id='annyoing:colon']\"");
    $("[id='annyoing:colon']").css("background-color", "red");
    
    
    
    
    
    
    
    
       oldTime=new Date().getTime();
    for(var i=0; i< 10000 ; i++){
      $(document.getElementById("annyoing:colon"));
    }
    console.error(new Date().getTime() - oldTime+ " $(document.getElementById(\"annyoing:colon\"))");
     $(document.getElementById("annyoing:colon")).css("background-color", "yellow");
  
    
    
    
    
    
    
    
    oldTime=new Date().getTime();
    for(var i=0; i< 10000 ; i++){
      $("#nocolon");
    }
    
    console.error(new Date().getTime() - oldTime + ' $("#nocolon") ');
    $("#nocolon").css("background-color", "blue");
    
    
    
    
    oldTime=new Date().getTime();
    for(var i=0; i< 10000 ; i++){
      $("[id='nocolon']");
    }
    console.error(new Date().getTime() - oldTime+ " $(\"[id='nocolon']\")");
     $("[id='nocolon']").css("background-color", "red");
  
    
    
 
  
  </script>
  
</body>
</html>
​
Output

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