SO MANY FONT SIZES.

count-font-sizes.js

/**
 * Count the number of distinct font sizes on the page.
 * 
 * Tested in Chrome, no idea if this works elsewhere.
 * 
 * @author Don McCurdy <dm@donmccurdy.com>
 *
 */
var sizes = {};
for (var i = 0; i < document.styleSheets.length; i++) {
  for (var j = 0; document.styleSheets[i].cssRules && j < document.styleSheets[i].cssRules.length; j++) {
    if (document.styleSheets[i].cssRules[j].style) {
      sizes[document.styleSheets[i].cssRules[j].style.fontSize] = true;
    }
  }
}
delete sizes[''];
console.info('This page has %d distinct font sizes.', sizes.length);