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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>
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