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diff --git a/testing/web-platform/tests/css/css-scoping/css-scoping-shadow-host-namespace.html b/testing/web-platform/tests/css/css-scoping/css-scoping-shadow-host-namespace.html
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+++ b/testing/web-platform/tests/css/css-scoping/css-scoping-shadow-host-namespace.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>CSS Scoping Module Level 1 - :host, :host-context, and default @namespace</title>
+    <link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com"/>
+    <link rel="help" href="https://www.w3.org/TR/css-scoping-1/#host-selector">
+    <link rel="help" href="https://www.w3.org/TR/css3-selectors/#typenmsp">
+    <link rel="help" href="https://www.w3.org/TR/css3-selectors/#univnmsp">
+    <link rel="match" href="reference/green-box.html"/>
+</head>
+<body>
+    <style>
+        .host {
+            display: block;
+            width: 100px;
+            height: 10px;
+            background: red;
+        }
+        #host-3, #host-5, #host-10 {
+            background: green;
+        }
+    </style>
+    <p>Test passes if you see a single 100px by 100px green box below.</p>
+    <div id="host-1" class="host">FAIL</div>
+    <div id="host-2" class="host">FAIL</div>
+    <div id="host-3" class="host">FAIL</div>
+    <div id="host-4" class="host">FAIL</div>
+    <div id="host-5" class="host">FAIL</div>
+    <div id="host-6" class="host">FAIL</div>
+    <div id="host-7" class="host">FAIL</div>
+    <div id="host-8" class="host">FAIL</div>
+    <div id="host-9" class="host">FAIL</div>
+    <div id="host-10" class="host">FAIL</div>
+    <script>
+        try {
+            var shadowHost = document.querySelector('#host-1');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://www.w3.org/1999/xhtml); :host { background: green !important; } </style>';
+
+            shadowHost = document.querySelector('#host-2');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://dummy); :host { background: green !important; } </style>';
+
+            shadowHost = document.querySelector('#host-3');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://dummy); :host(*) { background: red !important; } </style>';
+
+            shadowHost = document.querySelector('#host-4');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://dummy); :host(*|*) { background: green !important; } </style>';
+
+            shadowHost = document.querySelector('#host-5');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://dummy); :host-context(*) { background: red !important; } </style>';
+
+            shadowHost = document.querySelector('#host-6');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://dummy); :host-context(*|*) { background: green !important; } </style>';
+
+            shadowHost = document.querySelector('#host-7');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://www.w3.org/1999/xhtml); :host(*) { background: green !important; } </style>';
+
+            shadowHost = document.querySelector('#host-8');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://www.w3.org/1999/xhtml); :host-context(*) { background: green !important; } </style>';
+
+            shadowHost = document.querySelector('#host-9');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://www.w3.org/1999/xhtml); :host(div) { background: green !important; } </style>';
+
+            shadowHost = document.querySelector('#host-10');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<style>@namespace url(http://dummy); :host-context(html) { background: red !important; } </style>';
+
+        } catch (exception) {
+            document.body.appendChild(document.createTextNode(exception));
+        }
+
+    </script>
+</body>
+</html>