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diff --git a/testing/web-platform/tests/css/css-ui/appearance-auto-non-html-namespace-001.html b/testing/web-platform/tests/css/css-ui/appearance-auto-non-html-namespace-001.html
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+++ b/testing/web-platform/tests/css/css-ui/appearance-auto-non-html-namespace-001.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>CSS Basic User Interface Test: appearance: auto on elements in non-HTML namespace</title>
+<link rel="match" href="nothing-below-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-ui-4/#appearance-switching">
+<meta name="assert" content="appearance: auto should have no effect on non-HTML elements.">
+<style>
+ div * { appearance: auto; display: inline-block; width: 1em; height: 1em; }
+</style>
+<p>There should be nothing below:</p>
+<div id=div></div>
+<script>
+for (var tagName of ['button', 'input', 'meter', 'progress', 'select', 'textarea']) {
+ div.appendChild(document.createElementNS('not-html', tagName));
+}
+</script>