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Test Info:

<!DOCTYPE html>
<meta charset="UTF-8">
<title>dir() selector</title>
:dir(ltr) { color: blue }
:dir(rtl) { color: lime }
div { text-align: left; }
<script type="text/javascript">
function AppendElementWithChild() {
var x = document.createElement("span");
x.innerHTML = "This span should inherit rtl from the parent. ";
var y = document.createElement("span");
y.innerHTML = "This span should inherit rtl from the grandparent.";
var z = document.getElementById("z");
<body onload="AppendElementWithChild()">
<div id="z" dir="rtl">This element is rtl. </div>