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diff --git a/layout/reftests/webcomponents/fallback-content-1.html b/layout/reftests/webcomponents/fallback-content-1.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <script>
+ function tweak() {
+ // div with style "border: 10px solid green"
+ var shadowDiv = document.createElement("div");
+ shadowDiv.style.border = "10px solid green";
+
+ // Insertion point will match nothing and use fallback content.
+ var slot = document.createElement("slot");
+ shadowDiv.appendChild(slot);
+
+ // Append three nodes as children to use as fallback content.
+ slot.innerHTML = '<span style="background-color: orange">Hello</span> <span style="background-color: green">World</span>';
+
+ var shadowRoot = document.getElementById('outer').attachShadow({mode: 'open'});
+ shadowRoot.appendChild(shadowDiv);
+ }
+ </script>
+</head>
+<body onload="tweak()">
+<div id="outer"></div>
+</body>
+</html>