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<!DOCTYPE html>
<html>
<head>
  <title>Mozilla bug 1837268</title>
  <link rel=stylesheet href="/tests/SimpleTest/test.css">
  <script src="/tests/SimpleTest/EventUtils.js"></script>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/editor/spellchecker/tests/spellcheck.js"></script>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1837268">Mozilla Bug 1837268</a>
<p id="display"></p>
<div id="content" style="display: none;">

</div>

<div id="contenteditable" contenteditable=true>aabbcc</div>

<script>
const { maybeOnSpellCheck } = SpecialPowers.ChromeUtils.importESModule(
  "resource://testing-common/AsyncSpellCheckTestHelper.sys.mjs"
);

SimpleTest.waitForExplicitFinish();

function getEditor() {
  return SpecialPowers.wrap(window).docShell.editor;
}

SimpleTest.waitForFocus(async () => {
  let contenteditable = document.getElementById("contenteditable");
  contenteditable.addEventListener("beforeinput", (ev) => {
    ev.preventDefault();
    let text = contenteditable.textContent;
    const sel = window.getSelection();
    let offset = sel.anchorOffset;
    switch (ev.inputType) {
      case "insertText":
        text = text.substring(0, offset) + ev.data + text.substring(offset);
        offset += 1;
        break;
      case "deleteContentBackward":
        text = text.substring(0, offset - 1) + text.substring(offset);
        offset -= 1;
        break;
      default:
        return;
    }
    if (contenteditable.firstChild) {
      contenteditable.firstChild.nodeValue = text;
    } else {
      contenteditable.textContent = text;
    }
    sel.collapse(contenteditable.firstChild ?? contenteditable, offset);
  });

  let misspelledWords = [];
  misspelledWords.push("aabbc"); // One c removed.

  contenteditable.focus();
  window.getSelection().collapse(contenteditable.firstChild, contenteditable.firstChild.length);

  // Run spell checker
  await new Promise((resolve) => { maybeOnSpellCheck(contenteditable, resolve); });

  synthesizeKey("KEY_Backspace");
  synthesizeKey(" ");

  await new Promise((resolve) => { maybeOnSpellCheck(contenteditable, resolve); });
  let editor = getEditor();
  // isSpellingCheckOk is defined in spellcheck.js
  // eslint-disable-next-line no-undef
  ok(isSpellingCheckOk(editor, misspelledWords), "correct word is selected as misspelled");

  SimpleTest.finish();
});
</script>
</body>
</html>