<!doctype html>
<html>
<head>
  <link rel="help" href="http://www.w3.org/TR/selectors4/#dir-pseudo">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <style>
    #div4_1 {
      direction: rtl;
    }
  </style>
</head>

<!-- &#1514; is the Hebrew letter tav, i.e. RTL -->
<body>
  <div id=testDivs>
    <div id=div1 dir=auto>
      <div id=div1_1>a</div>
    </div>
    <div id=div2 dir=auto>
      <div id=div2_1>&#1514;</div>
    </div>
    <div id=div3 dir=auto>
      <div id=div3_1 dir=rtl>&#1514;</div>
      <div id=div3_2>a</div>
    </div>
    <div id=div4 dir=auto>
      <div id=div4_1>
        <div id=div4_1_1>a</div>
      </div>
    </div>
  </div>
</body>

<script>
function test_directionality(message, element, expected) {
  test(() => {
    var isLTR = document.querySelector("#" + element.id + ":dir(ltr)") == element;
    var isRTL = document.querySelector("#" + element.id + ":dir(rtl)") == element;
    if (expected == "ltr") {
      assert_true(isLTR);
      assert_false(isRTL);
    } else {
      assert_false(isLTR);
      assert_true(isRTL);
    }
  }, message + " directionality of element " + element.id + " is " + expected);
}

test_directionality("Initial ", div1, "ltr");
test_directionality("Initial ", div1_1, "ltr");
test_directionality("Initial ", div2, "rtl");
test_directionality("Initial ", div2_1, "rtl");
test_directionality("Initial ", div3, "ltr");
test_directionality("Initial ", div3_1, "rtl");
test_directionality("Initial ", div3_2, "ltr");
test_directionality("Initial ", div4, "ltr");
test_directionality("Initial ", div4_1, "ltr");
test_directionality("Initial ", div4_1_1, "ltr");

div1_1.innerText = "\u05EA";
div1_1.offsetTop;
test_directionality("Updated ", div1, "rtl");
test_directionality("Updated ", div1_1, "rtl");

div1_1.dir = "ltr";
div1_1.offsetTop;
test_directionality("Updated ", div1, "ltr");
test_directionality("Updated ", div1_1, "ltr");

div1_1.innerText = "a";
div1_1.offsetTop;
test_directionality("Reupdated ", div1, "ltr");
test_directionality("Reupdated ", div1_1, "ltr");

div2_1.remove();
div2.offsetTop;
test_directionality("Updated ", div2, "ltr");

div3_1.dir = "";
div3_1.offsetTop;
test_directionality("Updated ", div3, "rtl");
div3.appendChild(div3_1);
div3.offsetTop;
test_directionality("Updated ", div3, "ltr");

div4_1_1.innerText = "\u05EA";
div4_1_1.offsetTop;
test_directionality("Updated ", div4, "rtl");
test_directionality("Updated ", div4_1, "rtl");
test_directionality("Updated ", div4_1_1, "rtl");
</script>
</html>