title: How to hide html source code of website when user use view source option
body: <p>I see some websites hiding source code when i try to visit the 'View Source' option on the browser... like the following page...</p>
  
  <pre><code> view-source:https://www.swiggy.com/bangalore/restaurants
  </code></pre>
  
  <p>How do they do that ? what technology they use so it look some piece of javascript instead of fully formal HTML code that we use to generate a web page ?</p>
  
  <p>Also when i see the same swiggy.com website in a mobile phone that operates as same as the android app of them. Do they use any framework which help them to achieve this app feel or they use AJAX / HTML only to make us feel like same as their app ?</p>