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<!doctype html>
<style>
  div { display: contents }
</style>
<div></div>
<div></div>
<script>
  let divs = document.querySelectorAll('div');
  divs[0].attachShadow({mode: 'open'}).innerHTML = `
    <style>
      * { color: green; }
    </style>
    <span>Should be green</span>
  `;
  divs[1].attachShadow({mode: 'open'}).innerHTML = `
    <style>
      * { color: initial; }
      [foo] { }
    </style>
    <span>Should not be green</span>
  `;
</script>