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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/dynamic-markup-insertion/document-write/050.html 

<!doctype html>
<title>document.write plaintext</title>
<script src="/resources/testharness.js"></script><script src="/resources/testharnessreport.js"></script>
<div id="log"></div><script>
var t = async_test();

t.step(function() {
  document.write("<plaintext>");
  assert_equals(document.body.childNodes[2].nodeType, document.ELEMENT_NODE);
  assert_equals(document.body.childNodes[2].localName, "plaintext");
  var s = "Filler ";
  for (var i=0; i<s.length; i++) {
    document.write(s[i]);
    assert_equals(document.body.childNodes[2].textContent, s.slice(0,i+1));
  }
  document.close();
});

onload = function() {
  t.step(function() {
    assert_equals(document.body.childNodes[2].textContent, "Filler Text\n");
  });
  t.done();
}
</script>Text