(js css)getDefaultStyling

var getDefaultStyling = function(tagName){
    if(!tagName) tagName = "dummy-tag-name";

    //  Create dummy iframe

    var iframe = document.createElement("iframe");

    document.body.appendChild(iframe);

    //  Create element within the iframe's document

    var iframeDocument = iframe.contentDocument;
    var targetElement = iframeDocument.createElement(tagName);

    iframeDocument.body.appendChild(targetElement);

    //  Grab styling (CSSStyleDeclaration is live, and all values become "" after element removal)

    var styling = iframe.contentWindow.getComputedStyle(targetElement);
    var clonedStyling = {};

    for(var i = 0, len = styling.length; i < len; i++){
        var property = styling[i];

        clonedStyling[i] = property;
        clonedStyling[property] = styling[property];
    }

    //  Remove iframe

    document.body.removeChild(iframe);

    //  Return cloned styling

    return clonedStyling;
};

var getUniqueUserStyling = function(element){
    var allStyling = window.getComputedStyle(element);
    var defaultStyling = getDefaultStyling(element.tagName);

    var userStyling = {};

    for(var i = 0, len = allStyling.length; i < len; i++){
        var property = allStyling[i];
        var value = allStyling[property];
        var defaultValue = defaultStyling[property];

        if(value != defaultValue){
            userStyling[property] = value;
        }
    }

    return userStyling;
};