<!doctype html>
<title>document.write in an imported module</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
async_test(t => {
  // Expose {test} in the iframe for using the step_timeout helper.
  document.test = t;

  const iframe = document.createElement("iframe");
  iframe.onerror = t.unreached_func("Error loading iframe");

  document.addEventListener("documentWriteDone", t.step_func(() => {
    assert_equals(