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<script>
history_lengths = [];
var t = opener.t;
push_length = t.step_func(function () {
history_lengths.push(history.length)
});
do_test = t.step_func(function () {
try {
var start_length = history_lengths[0];
expected = [start_length, start_length + 1, start_length];
opener.assert_array_equals(history_lengths, expected);
t.done();
} finally {
window.close();
}
});
</script>
<iframe src="discard_iframe_history_4-2.html"></iframe>