title: Unable to use colspan in angular material table
body: <p>Is it possible to use colspan in angular material table or is there any other way that I can achieve colspan in any other way?</p>
  
  <p>I have tried [attr.colspan] but result is not proper.As soon as I added [attr.colspan] it apply colspan but move symbols to new unknown column.<a href="https://i.stack.imgur.com/3LK5N.png" rel="nofollow noreferrer">enter image description here</a></p>