title: HTML5 localStorage getting key from value
body: <p>localStorage.getItem will retrive value.</p>
  
  <p>and setItem will set value.</p>
  
  <p>But If I want to know which key was associated with this particular value? Then how to get Key of that.?</p>
  
  <p><a href="https://stackoverflow.com/questions/3357553/how-to-store-an-array-in-localstorage">so question I have reffered</a></p>