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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<script>
var expectedLoads = 3;
function load_done() {
--expectedLoads;
if (expectedLoads == 0) {
document.documentElement.className = "";
}
}
function addLink() {
var l = document.createElement("link");
l.rel = "stylesheet";
l.type = "text/css";
l.href = "data:text/css,some { random: data }";
l.onload = load_done;
document.getElementsByTagName("head")[0].appendChild(l);
}
function doIt() {
document.styleSheets[0].insertRule('a {}', 0)
addLink();
addLink();
}
addLink();
</script>
</head>
<body onload="doIt()">
<body>
</body>