title: Storing data client-side from one page to fill out a form on the other site
body: <p>I'd like to help the visitors to my site to fill out a form on the other site (beyond control) using the data, generated on my site. </p>
  
  <p>It would be possible to use a bookmarklet to post the data to the form while the user is on my site, but the form is some clicks behind the authentication. Considering that a bookmarklet may read only what's been stored (cookie, session, storage) while on the current site, it is not possible to use the bookmarklet on the other site to fill out the form with data, stored while on my site. </p>
  
  <p>Please, suggest any javascript, client-side solutions of this. Like a bookmarklet or something similar. </p>
  
  <p>Thank you.</p>