<!DOCTYPE html>
<title>document.writeln and null/undefined</title>
<link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-document-writeln%28%29">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#documents-in-the-dom">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
test(function() {
var iframe = document.createElement("iframe");
document.body.appendChild(iframe);
doc = iframe.contentDocument;
test(function() {
doc.open();
doc.writeln(null);
doc.close();
assert_equals(doc.documentElement.textContent, "null\n");
}, "document.writeln(null)");
test(function() {
doc.open();
doc.writeln(undefined);
doc.close();
assert_equals(doc.documentElement.textContent, "undefined\n");
}, "document.writeln(undefined)");
}, "Calling document.writeln with null and undefined");
</script>