check which styles are different bw two html elements

styleDiff.js

// check which style properties are different between two DOM elements
// obv. needs a browser with getComputedStyle
function styleDiff(first, second) {
    var oneStyle = getComputedStyle(first),
        twoStyle = getComputedStyle(second),
        diff = [],
        i,
        prop;

    for (i = 0; i < oneStyle.length; i++) {
        prop = oneStyle[i];
        if (oneStyle[prop] != twoStyle[prop]) diff.push(prop);
    }

    return diff;
}