​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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​
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
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<script>
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  $( function() {
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    $( "#start" ).click( function() {
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      $( "#animation" ).animate({
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        fontSize: "+=1.5em",
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        letterSpacing: "+=0.3em"
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      }, 4000 );  
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    });
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    $("#stop").click(function(){
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      $("#animation").stop();
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    });    
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  });
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</script>
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​
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<button id="start">Start Animation!</button>
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<button id="stop">Stop Animation!</button>
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​
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<div id="animation">Animation</div>