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diff --git a/layout/reftests/webcomponents/nested-shadow-element-1.html b/layout/reftests/webcomponents/nested-shadow-element-1.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <script>
+ function tweak() {
+ var olderShadow = document.getElementById('outer').createShadowRoot();
+ olderShadow.innerHTML = '<content></content><span>World</span>';
+
+ var youngerShadow = document.getElementById('outer').createShadowRoot();
+ youngerShadow.innerHTML = '<div id="shadowparent"><shadow id="youngshadow"><span>Hello</span></shadow></div>';
+
+ var shadowParent = youngerShadow.getElementById("shadowparent");
+ var nestedShadow = shadowParent.createShadowRoot();
+ nestedShadow.innerHTML = '<div style="background-color: green"><content></content></div>';
+
+ // Dynamically append a span to the shadow element in the younger ShadowRoot to make sure
+ // it is projected into the nested shadow.
+ var appendedSpan = document.createElement("span");
+ appendedSpan.textContent = ' ';
+ youngerShadow.getElementById("youngshadow").appendChild(appendedSpan);
+ }
+ </script>
+</head>
+<body onload="tweak()">
+<div id="outer">
+ <div style="width:300px; height:100px; background-color:red;"></div>
+</div>
+</body>
+</html>