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diff --git a/testing/web-platform/tests/html/dom/elements/global-attributes/dir-shadow-26.html b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-shadow-26.html
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+++ b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-shadow-26.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-26-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+اختبر.
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p dir="ltr"><slot></slot></p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>