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<!doctype html>
<script>
var result = "FAIL";
if (opener != null) {
result = "FAIL (did you open this page in a new tab?)";
} else {
var w = window.open("", "test_name");
if (w.location.href !== "about:blank") {
result = "FAIL (didn't open an about:blank browsing context)";
} else {
w.close();
result = "PASS";
}
document.write(result);
}
</script>