The StyleSheetList interface represents a list of StyleSheet.

It is an array-like object but can't be iterated over using Array methods. However It can be iterated over in a standard for loop over its indices, or converted to an Array.


Get document styleSheet objects with for loop

for (var i=0; i < document.styleSheets.length; i++){
  var styleSheet = document.styleSheets[i];

Get all CSS rules for the document using Array methods

var allCSS = 
        .reduce(function (prev, styleSheet) {
            if (styleSheet.cssRules) {
                return prev +
                        .reduce(function (prev, cssRule) {
                            return prev + cssRule.cssText;
                        }, '');
            } else {
                return prev;
        }, '');


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