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Test Info:

<!DOCTYPE html>
<style>
#target { color: red; }
#target.green { color: green; }
</style>
<span id="target">
<div></div>
First <span id="next"> Third</span>
<div></div>
</span>
<script>
onload = function() {
var s = document.querySelector("#target");
window.color = getComputedStyle(s).color;
s.className = "green";
window.newColor = getComputedStyle(s).color;
s.insertBefore(document.createTextNode("Second"),
s.querySelector("#next"));
}
</script>