title: localStorage not supported by IE9?
body: <p>Everybody say that <code>window.localStorage</code> is supported by IE (until IE8)</p>
  
  <p>I test it on IE9 but :</p>
  
  <pre><code>console.log(typeof window.localStorage)
  
  undefined
  </code></pre>
  
  <p>what does it mean?</p>
  
  <p>What's the best way to store local data for all browser?</p>