.getComputedStyle()

HTML

<div class="shadowed">
    <p>aaaaaaaaaaaaaa</p>
</div>

CSS

body { width:300px;margin:0 auto;}

.shadowed {
    -moz-box-shadow:2px 2px 3px #000;
    padding:10px;
    border:10px solid #000;
    color:#900;
}

JavaScript

var sbb = document.getElementsByClassName("shadowed")[0];
var sbbStyle = document.defaultView.getComputedStyle(sbb, "");
var a = sbbStyle.getPropertyValue("border");
var b = sbbStyle.getPropertyValue("border-left");
var c = sbbStyle.getPropertyValue("border-left-width");

//if(sbb.style.position==!"absolute"){ sbb.style.position = "relative"; }
console.log(sbbStyle)

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.getComputedStyle()

HTML

CSS

JavaScript

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Join the 4+ million users, and keep the JSFiddle dream alive.

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Console