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diff --git a/testing/web-platform/tests/html/dom/elements/global-attributes/dir-shadow-42.html b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-shadow-42.html
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+++ b/testing/web-platform/tests/html/dom/elements/global-attributes/dir-shadow-42.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a div in the shadow tree, dir=rtl on the shadow host, no slotted text in the light or dark trees</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="author" title="L. David Baron" href="mailto:dbaron@chromium.org">
+<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-42-ref.html">
+<style type="text/css">
+body {width: 600px;}
+#host {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on a div in the shadow tree, `dir=rtl` on the shadow host, no slotted text in the light or dark trees</p>
+<div id="host" dir="rtl"><span slot="x1"></span></div>
+<p id="result">The HTML direction / computed CSS `direction` value is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<div dir="ltr"><slot dir="auto" name="x1"></slot></div>`;
+  result.innerHTML += html_direction(root.querySelector("div[dir=ltr]").firstChild) + " / " + getComputedStyle(root.querySelector("div[dir=ltr]").firstChild).direction + " (on the " +  root.querySelector("div[dir=ltr]").firstChild.localName + ').';
+</script>
+
+</body>
+</html>