title: What is X-UA-Compatible when it references IE=edge,chrome=1?
body: <p>I just saw this meta tag in the wild and was wondering it does and why it's used?</p>
  
  <pre><code>&lt;meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /&gt;
  </code></pre>
  
  <p>Reading the <a href="http://webdesign.about.com/od/metataglibraries/p/x-ua-compatible-meta-tag.htm">documentation</a> on About.com, it says:</p>
  
  <blockquote>
    <p>"IE=edge" tells Internet Explorer to use the highest mode available to that version of IE. Internet Explorer 8 can support up to IE8 modes, IE9 can support IE9 modes and so on.</p>
  </blockquote>
  
  <p>But what about the <code>chrome=1</code> tag?</p>