File: test_shared_adopted_styles.html

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

  const innerHTMLText = `<div class="target"></div>`
  shadowHostA.attachShadow({mode: "open"}).innerHTML = innerHTMLText;
  shadowHostB.attachShadow({mode: "open"}).innerHTML = innerHTMLText;

  document.adoptedStyleSheets = [sheet];
  shadowHostA.shadowRoot.adoptedStyleSheets = [sheet];
  shadowHostB.shadowRoot.adoptedStyleSheets = [sheet];
</script>