Untitled

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="jquery.min.js"></script>
<script src="jquery.textfill.js" ></script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link href="https://fonts.googleapis.com/css?family=VT323|Happy+Monkey" rel='stylesheet' type='text/css' />
<link href="css/index.css" rel="stylesheet" type="text/css"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<title>Untitled Document</title>
</head>

<body>
<div class='demo' style='width:40px;height:30px;'>
  <span>teste</span>
</div>
<script>
$(function(){
  $('.textfill').textfill({
    maxFontPixels: 36, // sizing up the text as big as possible to this setting
    minFontPixel: 4, // minimal font size
    innerTag: 'span', // by default all <span/>s' font size in $(selector) will be changed to fill.
    callback: null, // callback when each element's (innerTag) font size is resized.
    success: null, // callback when a resizing is done
    fail: null, // callback when a resizing is failed
    complete: null, // callback when all elements are done.
    widthOnly: false, // only resizing for width restraint, this is intentionally used with CSS white-space: nowrap for header tags.
    explicitWidth: null, // explicit dimension
    explicitHeight: null, // explicit dimension
    changeLineHeight: false // resize line-height of parent
  });
});
</script>
</body>
</html>