File: test_caretPositionFromPoint_insertAnonymousContent.html

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Test for caretPositionFromPoint with anonymous content</title>
    <script src="/tests/SimpleTest/SimpleTest.js"></script>
    <script src="/tests/SimpleTest/EventUtils.js"></script>
    <link rel="stylesheet" href="/tests/SimpleTest/test.css" />
  </head>
  <body>
    <script>
      info("Inserting anonymous content into the document frame");
      let chromeDoc = SpecialPowers.wrap(document);
      let anonymousContent = chromeDoc.insertAnonymousContent();
      let div = document.createElement("div");
      div.style.position = "fixed";
      div.style.top = "0";
      div.style.left = "0";
      div.style.width = "100%";
      div.style.height = "100%";
      div.style.pointerEvents = "auto";
      div.style.backgroundColor = "red";
      anonymousContent.root.appendChild(div);
      let caretPos = document.caretPositionFromPoint(
        innerWidth / 2,
        innerHeight / 2
      );
      is(caretPos, null, "caretPos should be null");
      info("Removing the anonymous content");
      chromeDoc.removeAnonymousContent(anonymousContent);
    </script>
  </body>
</html>