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Test Info: Warnings

<!doctype html>
<title>document.open in beforeunload with button</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var t = async_test();
var win;
t.step(function() {
win = window.open("support/004-1.html");
});
add_completion_callback(function() {win.close()});
</script>