A script to use the chrome console to run analysis on number of selectors and rules in stylesheets on a page. A stylesheet reported as "null" means that the rules are not from a linked stylesheet but originate from style tags in the document.

stylesheet-analysis.js

var
  styleSheets = document.styleSheets,
  totalStyleSheets = styleSheets.length;

for (var j = 0; j < totalStyleSheets; j++){
  var
    styleSheet = styleSheets[j],
    rules = styleSheet.cssRules,
    totalRulesInStylesheet = rules.length,
    totalSelectorsInStylesheet = 0;

  for (var i = 0; i < totalRulesInStylesheet; i++) {
    if (rules[i].selectorText) {
      try {
        totalSelectorsInStylesheet += rules[i].selectorText.split(',').length;
	    } catch(err) {
	  	  console.log(err);
	    }
    }
  }
  console.log("Stylesheet: " + styleSheet.href);
  console.log("Total rules: " + totalRulesInStylesheet);
  console.log("Total selectors: " + totalSelectorsInStylesheet);
  alert("Stylesheet: " + styleSheet.href + "\n" + "Total rules: " + totalRulesInStylesheet + "\n" + "Total selectors: " + totalSelectorsInStylesheet)
}