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+<!DOCTYPE html>
+<html>
+<head>
+    <title>CSS Scoping Module Level 1 - overriding slot element's display value should generate boxes</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;
+            background: red;
+        }
+        my-host > div {
+            width: 50px;
+            height: 50px;
+            background: green;
+        }
+    </style>
+    <p>Test passes if you see a single 100px by 100px green box below.</p>
+    <my-host>
+        <div></div>
+    </my-host>
+    <script>
+
+        try {
+            var shadowHost = document.querySelector('my-host');
+            shadowRoot = shadowHost.attachShadow({mode: 'open'});
+            shadowRoot.innerHTML = '<slot style="display:block; border: solid 25px green;"></slot>';
+        } catch (exception) {
+            document.body.appendChild(document.createTextNode(exception));
+        }
+
+    </script>
+</body>
+</html>