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Test Info:

<!doctype html>
<title>object with length as transferable</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
test(function() {
assert_throws_js(TypeError, function() {
postMessage('', '*', {length:1});
});
});
</script>