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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
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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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