<a href="#">TIKLA</a>
<span>W3TR</span>
a{display: inline-block; background: #00FF99; padding:20px; border-bottom:4px solid #00CC00; color:#00CC99; text-decoration:none; margin-bottom:20px;}
span{display:block;}
$("body").delegate("a", "click",function(){
  $("span").css("font-size", "40px");
});

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