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Test Info:
<!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 slot = document.createElement("slot");
shadowDiv.appendChild(slot);
var shadowRoot = document.getElementById('outer').attachShadow({mode: 'open'});
shadowRoot.appendChild(shadowDiv);
}
</script>
</head>
<body onload="tweak()">
<div id="outer">Hello</div>
</body>
</html>