title: How to introduce simplest cross browser bug in angular 9 application?
body: <p>Recently I get to know about <a href="https://en.wikipedia.org/wiki/Polyfill_(programming)" rel="nofollow noreferrer">polyfill</a> that it reduces incompatibility among browsers and that has got added to my fresh angular project which I generated using angular-cli using <code>ng new my-app</code>.  </p>
  
  <p>In my case, I want to introduce a simple bug which is due to browser incapability. How can I do that without creating other side effects in angular 9 app?</p>