gecko-dev/layout/reftests/stylesheet-cloning/style-rule-clone.html

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HTML

<!DOCTYPE html>
<link rel="stylesheet" href="data:text/css,div { color: green }">
<link rel="stylesheet" href="data:text/css,div { color: green }">
<div>This should be green</div>
<script>
onload = function() {
var links = document.getElementsByTagName("link");
links[0].sheet.cssRules[0].style.color = "red";
}
</script>