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<!doctype html>
<title>Replacement of document prototype object after document.open</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<iframe src="004-1.html"></iframe>
<script>
var t = async_test();
var iframe;
onload = t.step_func(function() {
var iframe = document.getElementsByTagName("iframe")[0];
var handle = Object.getPrototypeOf(iframe.contentDocument);
handle.test_state = 1;
iframe.contentDocument.open();
var new_handle = Object.getPrototypeOf(iframe.contentDocument);
assert_equals(new_handle.test_state, undefined);
assert_not_equals(new_handle, handle);
t.done();
});
</script>
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