title: remove grey background on link clicked in ios safari / chrome / firefox
body: <p>When you click (touch) a link in Safari (or chrome or firefox)  for iOS, you get a grey background behind link (only while you're holding it). Is there a way to remove this feature using CSS? </p>
  
  <p>Please see the example image below:</p>
  
  <p><img src="https://i.stack.imgur.com/XhyIY.png" alt="enter image description here"></p>