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Get the difference in styles between two HTML nodes
function styleDelta(a, b) {
var aStyles = window.getComputedStyle(a)
, bStyles = window.getComputedStyle(b)
, delta = {}
Object.keys(aStyles).forEach(function(key) {
var aVal = aStyles[key]
, bVal = bStyles[key]
if (aVal != bVal) {
delta[key] = [aVal, bVal]
return delta
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