List all style blocks and sheets used within the page, and output to the console.

styles.js

(function() {
  var tab = [].slice.call(document.styleSheets).map(function(e) {
    return {
      size: e.cssRules.length / 1e3 + " kb",
      url: e.href || "Block"
    }
  });
  console.group("CSS Data");
  console.table(tab);
  console.groupEnd("CSS Data");
})();