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<!DOCTYPE HTML>
<html>
<head>
<script>
function tweak() {
// div with style "width:300px; height:100px; background-color:green"
var shadowDiv = document.createElement("div");
shadowDiv.style.width = "300px";
shadowDiv.style.height = "100px";
shadowDiv.style.backgroundColor = "green";
var shadowRoot = document.getElementById('outer').attachShadow({mode: 'open'});
shadowRoot.appendChild(shadowDiv);
}
</script>
</head>
<body onload="tweak()">
<div id="outer">
<div style="width:300px; height:100px; background-color:red;"></div>
</div>
</body>
</html>
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