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<!doctype html>
<meta charset="utf-8">
<body>
<script>
document.body.attachShadow({mode: "open"}).innerHTML = `
<div class="target"></div>
`;
const sheet = new CSSStyleSheet();
document.body.shadowRoot.adoptedStyleSheets = [sheet];
sheet.replaceSync(".target { width: 100px; height: 100px; border-style: solid; border-color: blue; }");
</script>