selector limit

new_gist_file

var timer,
    count_rule = 0,
    count_maxrule = 4600,
    sheet = document.styleSheets[0];

function addCSSRule(sheet, selector, rules, index) {
  if(sheet.insertRule) {
		sheet.insertRule(selector + "{" + rules + "}", index);
	}
	else {
		sheet.addRule(selector, rules, index);
	}
}

timer = setInterval(function(){
    if (count_rule>=count_maxrule) {
        clearInterval(timer);
    }
    console.log(count_rule);
    addCSSRule(sheet, "div", "background:red;");
    count_rule++;
}, 0);