title: Is it possible to store image on user's browser
body: <p>On my main page there is a big size image (~6 MB). It's kind of map.<br>
  I would like to store that image in user's browser even if they close browser or restart their PC, is it possible somehow?
  That image is used in CSS file if it matter.<br>
  My hosting has small bandwidth, so I would like to store that image as long as I can on user's browser
  Thanks for any tips.</p>