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Test Info:

<!doctype html>
<title>document.write comment into iframe</title>
<script src="/resources/testharness.js"></script><script src="/resources/testharnessreport.js"></script>
<iframe id="test"></iframe>
<script>
test(function() {
var iframe = document.getElementById("test");
var s = "<!--Filler-->";
for (var i=0; i<s.length; i++) {
iframe.contentDocument.write(s);
}
iframe.contentDocument.close();
assert_equals(iframe.contentDocument.childNodes[0].nodeType, document.COMMENT_NODE);
assert_equals(iframe.contentDocument.childNodes[0].data, "Filler");
});
</script>
<div id="log"></div>