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diff --git a/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/dir.html b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/dir.html
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index 000000000..8edd9b8ab
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+++ b/testing/web-platform/tests/html/semantics/selectors/pseudo-classes/dir.html
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+<!DOCTYPE html>
+<html id=html>
+  <head id=head>
+    <meta charset=utf-8 id=meta>
+    <title id=title>Selector: pseudo-classes (:dir(ltr), :dir(rtl))</title>
+    <link rel="author" title="Denis Ah-Kang" href="mailto:denis@w3.org" id=link1>
+    <link rel=help href="https://html.spec.whatwg.org/multipage/#pseudo-classes" id=link2>
+    <script src="/resources/testharness.js" id=script1></script>
+    <script src="/resources/testharnessreport.js" id=script2></script>
+    <script src="utils.js" id=script3></script>
+    <style id=style>
+      #span1 {direction: rtl;}
+      #span5, #span6 {display: none;}
+    </style>
+  </head>
+  <body id=body>
+    <div id="log"></div>
+    <bdo dir="rtl" id=bdo1>WERBEH</bdo>
+    <bdo dir="ltr" id=bdo2>HEBREW</bdo>
+    <bdi id=bdi1>HEBREW</bdi>
+    <bdi dir="rtl" id=bdi2>WERBEH</bdi>
+    <bdi dir="ltr" id=bdi3>HEBREW</bdi>
+    <bdi id=bdi4>إيان</bdi>
+    <span id=span1>WERBEH</span>
+    <span dir="rtl" id=span2>WERBEH</span>
+    <span dir="ltr" id=span3>HEBREW</span>
+    &#x202E;<span id=span4>WERBEH</span>&#x202C;
+    <span dir="rtl" id=span5>WERBEH</span>
+    <span dir="ltr" id=span6>HEBREW</span>
+    <bdo dir="auto" id=bdo3>HEBREW</bdo>
+    <bdo dir="auto" id=bdo4>إيان</bdo>
+    <bdo dir="ltr" id=bdo5>עברית</bdo>
+
+    <script id=script4>
+      testSelectorIdsMatch(":dir(rtl)", ["bdo1", "bdi2", "bdi4", "span2", "span5", "bdo4"], "':dir(rtl)' matches all elements whose directionality is 'rtl'.");
+
+      var ltrElements = ["html", "head", "meta", "title", "link1", "link2", "script1", "script2", "script3", "style", "body", "log", "bdo2", "bdi1", "bdi3", "span1", "span3", "span4", "span6", "bdo3", "bdo5", "script4"];
+
+      testSelectorIdsMatch(":dir(ltr)", ltrElements, "':dir(ltr)' matches all elements whose directionality is 'ltr'.");
+
+      var bdo = document.createElement("bdo");
+      bdo.setAttribute("dir", "ltr");
+      testSelectorIdsMatch(":dir(ltr)", ltrElements, "':dir(ltr)' doesn't match elements not in the document.");
+    </script>
+  </body>
+</html>