title: How does the Google Hangouts extension create the panel window?
body: <p>The <a href="http://code.google.com/chrome/extensions/windows.html" rel="nofollow noreferrer">Doc</a> says if you want to create a panel window ,you should use </p>
  
  <pre><code>chrome.windows.create({...,type:"panel"}, function callback)
  </code></pre>
  
  <p>At the same time, it says "Specifies what type of browser window to create. The 'panel' type creates a popup unless the '--enable-panels' flag is set."</p>
  
  <p>So you should go to "chrome://flags" to change it manually. But <a href="https://chrome.google.com/webstore/detail/chat-for-google/nckgahadagoaajjgafhacjanaoiihapd" rel="nofollow noreferrer">Google Hangouts</a> can create the panel without doing that. How does it do that?</p>