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Test Info:
<!DOCTYPE HTML>
<html>
<head>
<script>
function tweak() {
var slot = document.createElement("slot");
// The border shouldn't be visible, due to display: contents.
slot.style.border = "1px solid red";
slot.style.color = "green";
var shadowRoot =
document.getElementById('outer').attachShadow({mode: 'open'});
shadowRoot.appendChild(slot);
}
</script>
</head>
<body onload="tweak()">
<div id="outer">This text should be green</div>
</body>
</html>