Tryit Editor v1.8

Source Code:

<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js">
</script>
<script> 
$(document).ready(function(){
  $("#start").click(function(){
    $("div").animate({height:300},3000);
    $("div").animate({width:300},3000);
  });
  $("#stop").click(function(){
    $("div").stop();
  });
});
</script> 
</head>
<body>

<p>
<button id="start">Start Animation</button>
<button id="stop">Stop Current Animation</button>
</p>

<div style="background:#98bf21;height:100px;width:100px">
</div>
 
</body>
</html>

Result:

W3Schools.com - Try it yourself

Edit the code above and click "Submit Code" to see the result.