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dir-selector-auto.html
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<!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>
<!-- ת 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>ת</div>
</div>
<div id=div3 dir=auto>
<div id=div3_1 dir=rtl>ת</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>