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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";
var insertionPoint = document.createElement("content");
shadowDiv.appendChild(insertionPoint);
var shadowRoot = document.getElementById('outer').createShadowRoot();
shadowRoot.appendChild(shadowDiv);
}
</script>
</head>
<body onload="tweak()">
<div id="outer">
<span style="background-color: purple">Hello</span>
<span style="background-color: orange">World</span>
</div>
</body>
</html>
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