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diff --git a/testing/web-platform/tests/css/css-scoping/css-scoping-shadow-root-hides-children.html b/testing/web-platform/tests/css/css-scoping/css-scoping-shadow-root-hides-children.html
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+<!DOCTYPE html>
+<html>
+<head>
+    <title>CSS Scoping Module Level 1 - a shadow tree hides non-distributed children of the host</title>
+    <link rel="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org"/>
+    <link rel="help" href="http://www.w3.org/TR/css-scoping-1/#selectors-data-model">
+    <link rel="match" href="reference/green-box.html"/>
+</head>
+<body>
+    <style>
+    my-host {
+        display: block;
+        width: 100px;
+        height: 100px;
+    }
+    div {
+        width: 100%; height: 100%; background: red;
+    }
+    </style>
+    <p>Test passes if you see a single 100px by 100px green box below.</p>
+    <my-host>
+        <div>FAIL</div>
+    </my-host>
+    <script>
+
+    try {
+        var shadowHost = document.querySelector('my-host');
+        shadowRoot = shadowHost.attachShadow({mode: 'open'});
+        shadowRoot.innerHTML = '<div style="width: 100px; height: 100px; background: green; color:green">FAIL</div>';
+    } catch (exception) {
+        document.body.appendChild(document.createTextNode(exception));
+    }
+
+    </script>
+</body>
+</html>