fragid-shadow-9.html

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<!doctype html>

<style>

  #shadow {

    fill: red;

</style>

<div id="host"></div>

<script>

  host.attachShadow({ mode: "open" }).innerHTML = `

    <style>

      #shadow {

        fill: lime;

    </style>

    <svg width="100" height="100">

      <defs>

        <g id="shadow" width="100" height="100">

          <rect width="100" height="100" />

        </g>

      </defs>

      <use href="#shadow" />

    </svg>

`;

</script>