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diff --git a/layout/reftests/webcomponents/basic-shadow-3.html b/layout/reftests/webcomponents/basic-shadow-3.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <script>
+ function tweak() {
+ var shadowDiv = document.createElement("div");
+ shadowDiv.style.border = "10px solid green";
+
+ var shadowRoot = document.getElementById('outer').attachShadow({mode: 'open'});
+ shadowRoot.appendChild(shadowDiv);
+
+ var orangeDiv = document.createElement("div");
+ orangeDiv.style.border = "10px solid orange";
+
+ var purpleDiv = document.createElement("div");
+ purpleDiv.style.border = "10px solid purple";
+
+ shadowDiv.appendChild(purpleDiv);
+ shadowDiv.insertBefore(orangeDiv, purpleDiv);
+ shadowDiv.removeChild(purpleDiv);
+ }
+ </script>
+</head>
+<body onload="tweak()">
+<div id="outer">
+ <div style="background-color:red;"></div>
+</div>
+</body>
+</html>