layout/base/tests/chrome/test_document_adopted_styles.html


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