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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<script>
function tweak() {
// div with style "border: 10px solid green"
var outerShadow = document.createElement("div");
outerShadow.style.border = "10px solid green";
var outerInsertionPoint = document.createElement("slot");
outerShadow.appendChild(outerInsertionPoint);
// div with style "border: 10px solid orange"
var innerShadow = document.createElement("div");
innerShadow.style.border = "10px solid orange";
var slot = document.createElement("slot");
innerShadow.appendChild(slot);
outerShadow.attachShadow({mode: 'open'}).appendChild(innerShadow);
var shadowRoot =
document.getElementById('outer').attachShadow({mode: 'open'});
shadowRoot.appendChild(outerShadow);
}
</script>
</head>
<body onload="tweak()">
<div id="outer">Hello</div>
</body>
</html>