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(){
  var div = $("div");
  $("#start").click(function(){
    div.animate({height:300},"slow");
    div.animate({width:300},"slow");
    div.animate({height:100},"slow");
    div.animate({width:100},"slow");
  });
  $("#stop").click(function(){
    div.stop(true,true);
  });
});
</script> 
</head>
<body>

<p>
<button id="start">Start Animation</button>
<button id="stop">Stop But Complete All Animations Immediately</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.