title: How to select (highlight) text in Chrome app
body: <p>I'm playing with Chrome app and find it very interesting.</p>
  
  <p>But I wonder why how to select text inside a div in Chrome app.</p>
  
  <p>I tried but it seemed not work.</p>
  
  <p>Anyone knows the problem?</p>
  
  <p>Thanks!</p>
  
  <p>PS: This app read a text file, then output the result to a div.</p>