title: Retaining data in HTML form
body: <p>I have an HTML form. Let's say I fill out all the fields and submit it (PHP script runs here).
  Then I want to go back to the form using "Back" button of my browser.
  What I see is the empty form.
  What do I do to have the entered data retain on the page after I come back to it using "Back" button of the browser?</p>
  
  <p>Thank you!</p>