Returns all styling rules of the passed doc as a string

getStyle.js

function getStyles(doc) {
    /** idea from https://github.com/NYTimes/svg-crowbar **/
    var styles = '',
        styleSheets = doc.styleSheets;

    if (styleSheets) {
        for (var i = 0; i < styleSheets.length; i++) {
            processStyleSheet(styleSheets[i]);
        }
    }

    function processStyleSheet(ss) {
        if (ss.cssRules) {
            for (var i = 0; i < ss.cssRules.length; i++) {
                var rule = ss.cssRules[i];
                if (rule.type === 3) { // Type 3 is CSSImportRule
                    processStyleSheet(rule.styleSheet);
                } else {
                    // hack for illustrator crashing on descendant selectors
                    if (rule.selectorText) {
                        if (rule.selectorText.indexOf('>') === -1) {
                            styles += '\n' + rule.cssText;
                        }
                    }
                }
            }
        }
    }

    return styles;
}