<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="../include/editor-test-utils.js"></script>
<iframe srcdoc=""></iframe>
<script>
"use strict";
const iframe = document.querySelector("iframe");

promise_test(async () => {
  await new Promise(resolve => {
    addEven