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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <span id="span">Should end with excitement</span>
  
  <script>
    span.attachShadow({mode:'open'}).innerHTML =
      '<style>' +
        ':host::after { content: "!!!" }' +
      '</style>' +
      '<slot></slot>';
  </script>
</body>
</html>
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keanuleepro
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