title: How to do browser zoom in effect on click
body: <p>I want to add a browser zoom effect when a user clicks on a button.
  This is for elderly people so they can zoom in on the text to make it easier to read.
  I dont want to make the actual text bigger as it will mess up the layout of the webpage.
  How can i do this?</p>
  
  <p>I have seen the A A A buttons on several sites which achieve similar.</p>