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@tancnle
Forked from psebborn/countCSSRules.js
Created January 12, 2016 06:34
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Count the number of rules and selectors for CSS files on the page. Flags up the >4096 threshold that confuses IE
function countCSSRules() {
var results = '',
log = '';
if (!document.styleSheets) {
return;
}
for (var i = 0; i < document.styleSheets.length; i++) {
countSheet(document.styleSheets[i]);
}
function countSheet(sheet) {
var count = 0;
if (sheet && sheet.cssRules) {
for (var j = 0, l = sheet.cssRules.length; j < l; j++) {
if( !sheet.cssRules[j].selectorText ) {
continue;
}
count += sheet.cssRules[j].selectorText.split(',').length;
}
log += '\nFile: ' + (sheet.href ? sheet.href : 'inline <style> tag');
log += '\nRules: ' + sheet.cssRules.length;
log += '\nSelectors: ' + count;
log += '\n--------------------------';
if (count >= 4096) {
results += '\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);
console.log(results);
};
countCSSRules();
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