Count CSS Rules

countCSSRules.js

;(function () {
    var results = [],
        log = [],
        list = document.styleSheets;
    if (!list) {
        return;
    }
    for (var i = 0, x = list.length; i < x; i++) {
        countSheet(list[i]);
    }
    function countSheet(sheet) {
        var count = 0,
            rules;
        if (sheet && sheet.cssRules) {
            rules = sheet.cssRules
            for (var j = 0, l = rules.length; j < l; j++) {
                if( !rules[j].selectorText ) {
                    continue;
                }
                count += sheet.cssRules[j].selectorText.split(',').length;
            }

            log.push('\nFile: ' + (sheet.href ? sheet.href : 'inline <style> tag'));
            log.push('\nRules: ' + sheet.cssRules.length);
            log.push('\nSelectors: ' + count);
            log.push('\n--------------------------');
            if (count >= 4096) {
                results.push('\n********************************\nWARNING:\n There are ' + count + ' CSS rules in the stylesheet ' + sheet.href + ' - IE will ignore the last ' + (count - 4096) + ' rules!\n');
            }
        }
    }
    console.log(log.join(''));
    console.log(results.join(''));
}());