title: How does telegram shows the Icon of some websites?
body: <p>I am working with telegram on windows and its online version on web.telegram.org, when I share a link with my friend Telegram shows the icon or logo of some websites in that message:</p>
  
  <p><a href="https://i.stack.imgur.com/dvzzY.png" rel="noreferrer">Image</a></p>
  
  <p>The first website is <em>vajehyab.com</em> and it has a <strong>favicon</strong> too (But do not showing that website icon), and the second is Stackoverflow and as you see the logo of stackoverflow and a litle description shows beside it.</p>
  
  <p>Does websites do something or having some metadata that allow Telegram to access their logo, or it is an static program form Telegram programmers and the set some famous websites logo?</p>